Re: [bolger] Re: finger joints - destructive tests
Destructive testing is going to be difficult:
1) If you bend the joint, the position of the fingers
in the joint will be critical: assume the finger under
tension, at the surface has one of those little flats,
that are essentialy a butt joint, that should be much
less strong than if the surface was composed of the
6-1 runout. That flat on the compresion side wouldn't
be a problem. How this is all layed out depends on
the dimensions of the wood, the bit, and the worker.
2) Consider grade. Assume the FGs were as strong as
6-1 scarphs, that piece might break outside the joint.
That's great, but 6-1 scarph performance would only
be decent in poor wood. Tradition indicates good boat
wood is in the 8-1 and better area, while aircraft
wood is graded to the 12-1 and better area. But I
don't think all these instant boats are being made
with boat grade lumber, I just used 2x4 studs for the
shear on my Fat Eeek! So in certain cases 6-1 is
going to be good enough (not to suggest FGs are that
good)
3) An important issue would be how you are using the
wood, all we really need is stronger than strong
enough. Lets say you are making a shear, and it will
be glued to a plywood panel, lets say there is a lot
of curve in that flat panel (Elegant punt for
instance), but as luck would have it not much where
the FG will fall, so you know it will survive that
bend. But hold on, when we spring the sides arround
that bulkhead to pop the plan shape in, the FG will be
at the steepest point of that curve. Hey, but the
good news is you already reenforced the FG by gluing
it to the continuous plywood panel of the side, so
that works too, it's mostly neutral to compresion
axis...
4) this discusion did start with the cost of saving
some wood. I just cut out two scarphs for the outside
clamps on Fat Eeek! I just layed down the lines,
bandsawed them, and used a block plane for about 30
seconds to fair them. One finishing nail and a few
small clamps glued it up. They were 8-1 scarps. I
would argue that a better joint in lower grade lumber
is probably a better cost savings than degrading the
lumber with a 6-1 scarph, but saving 2-3 square inches
of wood. No special router bit required. When you
make a scarph you give up half the scarph length in
wood, in my case 3 inches. But in fact I was
lengthening these 10' pieces to 12' with scrap from
arround the shop, so what did that really cost me?
bits and epoxy? How did they hold up?<BR>
<BR>
______________________________________________________
Send your holiday cheer withhttp://greetings.yahoo.ca
1) If you bend the joint, the position of the fingers
in the joint will be critical: assume the finger under
tension, at the surface has one of those little flats,
that are essentialy a butt joint, that should be much
less strong than if the surface was composed of the
6-1 runout. That flat on the compresion side wouldn't
be a problem. How this is all layed out depends on
the dimensions of the wood, the bit, and the worker.
2) Consider grade. Assume the FGs were as strong as
6-1 scarphs, that piece might break outside the joint.
That's great, but 6-1 scarph performance would only
be decent in poor wood. Tradition indicates good boat
wood is in the 8-1 and better area, while aircraft
wood is graded to the 12-1 and better area. But I
don't think all these instant boats are being made
with boat grade lumber, I just used 2x4 studs for the
shear on my Fat Eeek! So in certain cases 6-1 is
going to be good enough (not to suggest FGs are that
good)
3) An important issue would be how you are using the
wood, all we really need is stronger than strong
enough. Lets say you are making a shear, and it will
be glued to a plywood panel, lets say there is a lot
of curve in that flat panel (Elegant punt for
instance), but as luck would have it not much where
the FG will fall, so you know it will survive that
bend. But hold on, when we spring the sides arround
that bulkhead to pop the plan shape in, the FG will be
at the steepest point of that curve. Hey, but the
good news is you already reenforced the FG by gluing
it to the continuous plywood panel of the side, so
that works too, it's mostly neutral to compresion
axis...
4) this discusion did start with the cost of saving
some wood. I just cut out two scarphs for the outside
clamps on Fat Eeek! I just layed down the lines,
bandsawed them, and used a block plane for about 30
seconds to fair them. One finishing nail and a few
small clamps glued it up. They were 8-1 scarps. I
would argue that a better joint in lower grade lumber
is probably a better cost savings than degrading the
lumber with a 6-1 scarph, but saving 2-3 square inches
of wood. No special router bit required. When you
make a scarph you give up half the scarph length in
wood, in my case 3 inches. But in fact I was
lengthening these 10' pieces to 12' with scrap from
arround the shop, so what did that really cost me?
>>Has anyone destructively tested finger joints madewith exisiting <BR>
bits and epoxy? How did they hold up?<BR>
<BR>
______________________________________________________
Send your holiday cheer withhttp://greetings.yahoo.ca
Actualy, I was wondering how strong the joint from existing cutters
would be, not what type of cutter you would need to make a 12-1 joint.
I think the taper on existing cutters is about 6-1.
Has anyone destructively tested finger joints made with exisiting
bits and epoxy? How did they hold up?
would be, not what type of cutter you would need to make a 12-1 joint.
I think the taper on existing cutters is about 6-1.
Has anyone destructively tested finger joints made with exisiting
bits and epoxy? How did they hold up?
--- In bolger@y..., "Bill Kreamer" <kreamer@m...> wrote:
> I correct myself. That cutter would be 5-1/4" diameter! Don, for
the
> same tip speed as your chart, the cutter RPM would be 700 RPM. What
> would the cutting action be like? It might have a wicked tendency
to
> kick?! The horsepower requirement would be pretty high. I`d be
afraid
> of it. What could you run it on?
>
> Bill Kreamer, President
> Sol-Air Company
> 129 Miller St.
> Belfast, Maine, U.S.A. 04915
>
> Tel 207-338-9513
> Fax 208-978-7839
> Email kreamer@m...
>
> -----Original Message-----
> From: Don Theobald [mailto:DONTHEOBALD@H...]
> Sent: Thursday, December 06, 2001 6:58 AM
> To: bolger@y...
> Subject: RE: [bolger] finger joints vs scarphs
>
> Bill,
>
> A 2 5/8 dia. cutter should not exceed approx. 1400 RPM. This is
based on
> a
> chart that
> came with my Frued, 3 HP plunge router.
>
>
> -----Original Message-----
> From: Bill Kreamer [mailto:kreamer@m...]
> Sent: Wednesday, December 05, 2001 3:36 PM
> To: bolger@y...
> Subject: RE: [bolger] finger joints vs scarphs
>
>
> It's possible, but not easy, to get a finger-joint that is nearly
as
> strong as a scarf. All the flats on the router cutter make weak
> joint-planes that are perpendicular to the panel faces.
>
> You would minimize the effect of that if you designed cutter
profile
> with two 1:12 side-angle fingers (9.53 deg included angle), with
> 1/16"-wide flats on their tips and between them. That puts a
1/16"
> flat
> at center of the joint, and a 1/32" half-flat at the surface on
each
> face of the panel.
>
> That's an all-in-one cutter. You would raise and lower it in the
> router
> table as required to get the matching male and female profiles.
You
> could make separate male and female cutters for each plywood
> thickness,
> the male with one finger and the female with two.
>
> With the fingers having 1:12 side-angles, they are 2-1/4" long and
> have
> a long, thin shape. If you place finger profile on a cutter so
its
> inboard end is at the 3/4" diameter, the cutter has a 2-5/8"
overall
> diameter. What rpm would you turn that at?
>
> Bill
> -----Original Message-----
> From: richard@s...
> [mailto:richard@s...]
> Sent: Tuesday, December 04, 2001 5:30 PM
> To: bolger@y...
> Subject: [bolger] finger joints vs scarphs
>
> A finger joint would seem to be a lot of little scarph joints.
Made
> up good boards in the lumber yard are joined with finger joints.
>
>
http://www.jesada.com/australia/instructions/finger_joint_instructions
> .html
>
> It would seem you would save a lot of expensive wood if you could
use
> the bit above instead of making a scarph.
>
>
> Anybody have any idea of the relative strengths of finger joints
vs
> scarphs?
>
>
>
>
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>
> Bolger rules!!!
> - no cursing, flaming, trolling, spamming, or flogging dead horses
> - pls take "personals" off-list, stay on topic, and punctuate
> - add your comments at the TOP and SIGN your posts, snip all you
like
> - To order plans: Mr. Philip C. Bolger, P.O. Box 1209,
Gloucester, MA,
> 01930, Fax: (978) 282-1349
> - Unsubscribe: bolger-unsubscribe@y...
>
> Your use of Yahoo! Groups is subject to the Yahoo! Terms of
Service
> <http://docs.yahoo.com/info/terms/> .
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>
> [Non-text portions of this message have been removed]
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>
> Yahoo! Groups Sponsor
> ADVERTISEMENT
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>
>
>
> Bolger rules!!!
> - no cursing, flaming, trolling, spamming, or flogging dead horses
> - pls take "personals" off-list, stay on topic, and punctuate
> - add your comments at the TOP and SIGN your posts, snip all you
like
> - To order plans: Mr. Philip C. Bolger, P.O. Box 1209,
Gloucester, MA,
> 01930, Fax: (978) 282-1349
> - Unsubscribe: bolger-unsubscribe@y...
>
> Your use of Yahoo! Groups is subject to the Yahoo! Terms of
Service.
>
>
>
> [Non-text portions of this message have been removed]
>
>
> Bolger rules!!!
> - no cursing, flaming, trolling, spamming, or flogging dead horses
> - pls take "personals" off-list, stay on topic, and punctuate
> - add your comments at the TOP and SIGN your posts, snip all you
like
> - To order plans: Mr. Philip C. Bolger, P.O. Box 1209, Gloucester,
MA,
> 01930, Fax: (978) 282-1349
> - Unsubscribe: bolger-unsubscribe@y...
>
> Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service
> <http://docs.yahoo.com/info/terms/> .
>
>
> [Non-text portions of this message have been removed]
I correct myself. That cutter would be 5-1/4" diameter! Don, for the
same tip speed as your chart, the cutter RPM would be 700 RPM. What
would the cutting action be like? It might have a wicked tendency to
kick?! The horsepower requirement would be pretty high. Id be afraid
of it. What could you run it on?
Bill Kreamer, President
Sol-Air Company
129 Miller St.
Belfast, Maine, U.S.A. 04915
Tel 207-338-9513
Fax 208-978-7839
Emailkreamer@...
-----Original Message-----
From: Don Theobald [mailto:DONTHEOBALD@...]
Sent: Thursday, December 06, 2001 6:58 AM
To:bolger@yahoogroups.com
Subject: RE: [bolger] finger joints vs scarphs
Bill,
A 2 5/8 dia. cutter should not exceed approx. 1400 RPM. This is based on
a
chart that
came with my Frued, 3 HP plunge router.
-----Original Message-----
From: Bill Kreamer [mailto:kreamer@...]
Sent: Wednesday, December 05, 2001 3:36 PM
To:bolger@yahoogroups.com
Subject: RE: [bolger] finger joints vs scarphs
Its possible, but not easy, to get a finger-joint that is nearly as
strong as a scarf. All the flats on the router cutter make weak
joint-planes that are perpendicular to the panel faces.
You would minimize the effect of that if you designed cutter profile
with two 1:12 side-angle fingers (9.53 deg included angle), with
1/16"-wide flats on their tips and between them. That puts a 1/16"
flat
at center of the joint, and a 1/32" half-flat at the surface on each
face of the panel.
Thats an all-in-one cutter. You would raise and lower it in the
router
table as required to get the matching male and female profiles. You
could make separate male and female cutters for each plywood
thickness,
the male with one finger and the female with two.
With the fingers having 1:12 side-angles, they are 2-1/4" long and
have
a long, thin shape. If you place finger profile on a cutter so its
inboard end is at the 3/4" diameter, the cutter has a 2-5/8" overall
diameter. What rpm would you turn that at?
Bill
-----Original Message-----
From:richard@...
[mailto:richard@...]
Sent: Tuesday, December 04, 2001 5:30 PM
To:bolger@yahoogroups.com
Subject: [bolger] finger joints vs scarphs
A finger joint would seem to be a lot of little scarph joints. Made
up good boards in the lumber yard are joined with finger joints.
http://www.jesada.com/australia/instructions/finger_joint_instructions
.html
It would seem you would save a lot of expensive wood if you could use
the bit above instead of making a scarph.
Anybody have any idea of the relative strengths of finger joints vs
scarphs?
Yahoo! Groups Sponsor
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http://rd.yahoo.com/M=178320.1681224.3270152.1261774/D=egroupweb/S=1705
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Bolger rules!!!
- no cursing, flaming, trolling, spamming, or flogging dead horses
- pls take "personals" off-list, stay on topic, and punctuate
- add your comments at the TOP and SIGN your posts, snip all you like
- To order plans: Mr. Philip C. Bolger, P.O. Box 1209, Gloucester, MA,
01930, Fax: (978) 282-1349
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[Non-text portions of this message have been removed]
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Bolger rules!!!
- no cursing, flaming, trolling, spamming, or flogging dead horses
- pls take "personals" off-list, stay on topic, and punctuate
- add your comments at the TOP and SIGN your posts, snip all you like
- To order plans: Mr. Philip C. Bolger, P.O. Box 1209, Gloucester, MA,
01930, Fax: (978) 282-1349
- Unsubscribe:bolger-unsubscribe@yahoogroups.com
Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
[Non-text portions of this message have been removed]
Bolger rules!!!
- no cursing, flaming, trolling, spamming, or flogging dead horses
- pls take "personals" off-list, stay on topic, and punctuate
- add your comments at the TOP and SIGN your posts, snip all you like
- To order plans: Mr. Philip C. Bolger, P.O. Box 1209, Gloucester, MA,
01930, Fax: (978) 282-1349
- Unsubscribe:bolger-unsubscribe@yahoogroups.com
Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service
<http://docs.yahoo.com/info/terms/> .
[Non-text portions of this message have been removed]
same tip speed as your chart, the cutter RPM would be 700 RPM. What
would the cutting action be like? It might have a wicked tendency to
kick?! The horsepower requirement would be pretty high. Id be afraid
of it. What could you run it on?
Bill Kreamer, President
Sol-Air Company
129 Miller St.
Belfast, Maine, U.S.A. 04915
Tel 207-338-9513
Fax 208-978-7839
Emailkreamer@...
-----Original Message-----
From: Don Theobald [mailto:DONTHEOBALD@...]
Sent: Thursday, December 06, 2001 6:58 AM
To:bolger@yahoogroups.com
Subject: RE: [bolger] finger joints vs scarphs
Bill,
A 2 5/8 dia. cutter should not exceed approx. 1400 RPM. This is based on
a
chart that
came with my Frued, 3 HP plunge router.
-----Original Message-----
From: Bill Kreamer [mailto:kreamer@...]
Sent: Wednesday, December 05, 2001 3:36 PM
To:bolger@yahoogroups.com
Subject: RE: [bolger] finger joints vs scarphs
Its possible, but not easy, to get a finger-joint that is nearly as
strong as a scarf. All the flats on the router cutter make weak
joint-planes that are perpendicular to the panel faces.
You would minimize the effect of that if you designed cutter profile
with two 1:12 side-angle fingers (9.53 deg included angle), with
1/16"-wide flats on their tips and between them. That puts a 1/16"
flat
at center of the joint, and a 1/32" half-flat at the surface on each
face of the panel.
Thats an all-in-one cutter. You would raise and lower it in the
router
table as required to get the matching male and female profiles. You
could make separate male and female cutters for each plywood
thickness,
the male with one finger and the female with two.
With the fingers having 1:12 side-angles, they are 2-1/4" long and
have
a long, thin shape. If you place finger profile on a cutter so its
inboard end is at the 3/4" diameter, the cutter has a 2-5/8" overall
diameter. What rpm would you turn that at?
Bill
-----Original Message-----
From:richard@...
[mailto:richard@...]
Sent: Tuesday, December 04, 2001 5:30 PM
To:bolger@yahoogroups.com
Subject: [bolger] finger joints vs scarphs
A finger joint would seem to be a lot of little scarph joints. Made
up good boards in the lumber yard are joined with finger joints.
http://www.jesada.com/australia/instructions/finger_joint_instructions
.html
It would seem you would save a lot of expensive wood if you could use
the bit above instead of making a scarph.
Anybody have any idea of the relative strengths of finger joints vs
scarphs?
Yahoo! Groups Sponsor
ADVERTISEMENT
<
http://rd.yahoo.com/M=178320.1681224.3270152.1261774/D=egroupweb/S=1705
065791:HM/A=879173/R=0/*http://www.fastweb.com/ib/yahoo-76f>
Bolger rules!!!
- no cursing, flaming, trolling, spamming, or flogging dead horses
- pls take "personals" off-list, stay on topic, and punctuate
- add your comments at the TOP and SIGN your posts, snip all you like
- To order plans: Mr. Philip C. Bolger, P.O. Box 1209, Gloucester, MA,
01930, Fax: (978) 282-1349
- Unsubscribe:bolger-unsubscribe@yahoogroups.com
Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service
<http://docs.yahoo.com/info/terms/> .
[Non-text portions of this message have been removed]
Yahoo! Groups Sponsor
ADVERTISEMENT
Bolger rules!!!
- no cursing, flaming, trolling, spamming, or flogging dead horses
- pls take "personals" off-list, stay on topic, and punctuate
- add your comments at the TOP and SIGN your posts, snip all you like
- To order plans: Mr. Philip C. Bolger, P.O. Box 1209, Gloucester, MA,
01930, Fax: (978) 282-1349
- Unsubscribe:bolger-unsubscribe@yahoogroups.com
Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
[Non-text portions of this message have been removed]
Bolger rules!!!
- no cursing, flaming, trolling, spamming, or flogging dead horses
- pls take "personals" off-list, stay on topic, and punctuate
- add your comments at the TOP and SIGN your posts, snip all you like
- To order plans: Mr. Philip C. Bolger, P.O. Box 1209, Gloucester, MA,
01930, Fax: (978) 282-1349
- Unsubscribe:bolger-unsubscribe@yahoogroups.com
Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service
<http://docs.yahoo.com/info/terms/> .
[Non-text portions of this message have been removed]
Bill,
A 2 5/8 dia. cutter should not exceed approx. 1400 RPM. This is based on a
chart that
came with my Frued, 3 HP plunge router.
-----Original Message-----
From: Bill Kreamer [mailto:kreamer@...]
Sent: Wednesday, December 05, 2001 3:36 PM
To:bolger@yahoogroups.com
Subject: RE: [bolger] finger joints vs scarphs
Its possible, but not easy, to get a finger-joint that is nearly as
strong as a scarf. All the flats on the router cutter make weak
joint-planes that are perpendicular to the panel faces.
You would minimize the effect of that if you designed cutter profile
with two 1:12 side-angle fingers (9.53 deg included angle), with
1/16"-wide flats on their tips and between them. That puts a 1/16" flat
at center of the joint, and a 1/32" half-flat at the surface on each
face of the panel.
Thats an all-in-one cutter. You would raise and lower it in the router
table as required to get the matching male and female profiles. You
could make separate male and female cutters for each plywood thickness,
the male with one finger and the female with two.
With the fingers having 1:12 side-angles, they are 2-1/4" long and have
a long, thin shape. If you place finger profile on a cutter so its
inboard end is at the 3/4" diameter, the cutter has a 2-5/8" overall
diameter. What rpm would you turn that at?
Bill
-----Original Message-----
From:richard@...[mailto:richard@...]
Sent: Tuesday, December 04, 2001 5:30 PM
To:bolger@yahoogroups.com
Subject: [bolger] finger joints vs scarphs
A finger joint would seem to be a lot of little scarph joints. Made
up good boards in the lumber yard are joined with finger joints.
http://www.jesada.com/australia/instructions/finger_joint_instructions
.html
It would seem you would save a lot of expensive wood if you could use
the bit above instead of making a scarph.
Anybody have any idea of the relative strengths of finger joints vs
scarphs?
Yahoo! Groups Sponsor
ADVERTISEMENT
<http://rd.yahoo.com/M=178320.1681224.3270152.1261774/D=egroupweb/S=1705
065791:HM/A=879173/R=0/*http://www.fastweb.com/ib/yahoo-76f>
Bolger rules!!!
- no cursing, flaming, trolling, spamming, or flogging dead horses
- pls take "personals" off-list, stay on topic, and punctuate
- add your comments at the TOP and SIGN your posts, snip all you like
- To order plans: Mr. Philip C. Bolger, P.O. Box 1209, Gloucester, MA,
01930, Fax: (978) 282-1349
- Unsubscribe:bolger-unsubscribe@yahoogroups.com
Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service
<http://docs.yahoo.com/info/terms/> .
[Non-text portions of this message have been removed]
Yahoo! Groups Sponsor
ADVERTISEMENT
Bolger rules!!!
- no cursing, flaming, trolling, spamming, or flogging dead horses
- pls take "personals" off-list, stay on topic, and punctuate
- add your comments at the TOP and SIGN your posts, snip all you like
- To order plans: Mr. Philip C. Bolger, P.O. Box 1209, Gloucester, MA,
01930, Fax: (978) 282-1349
- Unsubscribe:bolger-unsubscribe@yahoogroups.com
Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
[Non-text portions of this message have been removed]
A 2 5/8 dia. cutter should not exceed approx. 1400 RPM. This is based on a
chart that
came with my Frued, 3 HP plunge router.
-----Original Message-----
From: Bill Kreamer [mailto:kreamer@...]
Sent: Wednesday, December 05, 2001 3:36 PM
To:bolger@yahoogroups.com
Subject: RE: [bolger] finger joints vs scarphs
Its possible, but not easy, to get a finger-joint that is nearly as
strong as a scarf. All the flats on the router cutter make weak
joint-planes that are perpendicular to the panel faces.
You would minimize the effect of that if you designed cutter profile
with two 1:12 side-angle fingers (9.53 deg included angle), with
1/16"-wide flats on their tips and between them. That puts a 1/16" flat
at center of the joint, and a 1/32" half-flat at the surface on each
face of the panel.
Thats an all-in-one cutter. You would raise and lower it in the router
table as required to get the matching male and female profiles. You
could make separate male and female cutters for each plywood thickness,
the male with one finger and the female with two.
With the fingers having 1:12 side-angles, they are 2-1/4" long and have
a long, thin shape. If you place finger profile on a cutter so its
inboard end is at the 3/4" diameter, the cutter has a 2-5/8" overall
diameter. What rpm would you turn that at?
Bill
-----Original Message-----
From:richard@...[mailto:richard@...]
Sent: Tuesday, December 04, 2001 5:30 PM
To:bolger@yahoogroups.com
Subject: [bolger] finger joints vs scarphs
A finger joint would seem to be a lot of little scarph joints. Made
up good boards in the lumber yard are joined with finger joints.
http://www.jesada.com/australia/instructions/finger_joint_instructions
.html
It would seem you would save a lot of expensive wood if you could use
the bit above instead of making a scarph.
Anybody have any idea of the relative strengths of finger joints vs
scarphs?
Yahoo! Groups Sponsor
ADVERTISEMENT
<http://rd.yahoo.com/M=178320.1681224.3270152.1261774/D=egroupweb/S=1705
065791:HM/A=879173/R=0/*http://www.fastweb.com/ib/yahoo-76f>
Bolger rules!!!
- no cursing, flaming, trolling, spamming, or flogging dead horses
- pls take "personals" off-list, stay on topic, and punctuate
- add your comments at the TOP and SIGN your posts, snip all you like
- To order plans: Mr. Philip C. Bolger, P.O. Box 1209, Gloucester, MA,
01930, Fax: (978) 282-1349
- Unsubscribe:bolger-unsubscribe@yahoogroups.com
Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service
<http://docs.yahoo.com/info/terms/> .
[Non-text portions of this message have been removed]
Yahoo! Groups Sponsor
ADVERTISEMENT
Bolger rules!!!
- no cursing, flaming, trolling, spamming, or flogging dead horses
- pls take "personals" off-list, stay on topic, and punctuate
- add your comments at the TOP and SIGN your posts, snip all you like
- To order plans: Mr. Philip C. Bolger, P.O. Box 1209, Gloucester, MA,
01930, Fax: (978) 282-1349
- Unsubscribe:bolger-unsubscribe@yahoogroups.com
Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
[Non-text portions of this message have been removed]
Is the resultant entity going to be used under
compresion or tension, or both for that mater. I
imagine one could use FGs on a lot of stringers,
though I wouldn't choose to do so just to save about
45 cents...
--- Bill Kreamer <kreamer@...> wrote:
<HR>
<html><body>
______________________________________________________
Send your holiday cheer withhttp://greetings.yahoo.ca
compresion or tension, or both for that mater. I
imagine one could use FGs on a lot of stringers,
though I wouldn't choose to do so just to save about
45 cents...
--- Bill Kreamer <kreamer@...> wrote:
<HR>
<html><body>
______________________________________________________
Send your holiday cheer withhttp://greetings.yahoo.ca
Its possible, but not easy, to get a finger-joint that is nearly as
strong as a scarf. All the flats on the router cutter make weak
joint-planes that are perpendicular to the panel faces.
You would minimize the effect of that if you designed cutter profile
with two 1:12 side-angle fingers (9.53 deg included angle), with
1/16"-wide flats on their tips and between them. That puts a 1/16" flat
at center of the joint, and a 1/32" half-flat at the surface on each
face of the panel.
Thats an all-in-one cutter. You would raise and lower it in the router
table as required to get the matching male and female profiles. You
could make separate male and female cutters for each plywood thickness,
the male with one finger and the female with two.
With the fingers having 1:12 side-angles, they are 2-1/4" long and have
a long, thin shape. If you place finger profile on a cutter so its
inboard end is at the 3/4" diameter, the cutter has a 2-5/8" overall
diameter. What rpm would you turn that at?
Bill
-----Original Message-----
From:richard@...[mailto:richard@...]
Sent: Tuesday, December 04, 2001 5:30 PM
To:bolger@yahoogroups.com
Subject: [bolger] finger joints vs scarphs
A finger joint would seem to be a lot of little scarph joints. Made
up good boards in the lumber yard are joined with finger joints.
http://www.jesada.com/australia/instructions/finger_joint_instructions
.html
It would seem you would save a lot of expensive wood if you could use
the bit above instead of making a scarph.
Anybody have any idea of the relative strengths of finger joints vs
scarphs?
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[Non-text portions of this message have been removed]
strong as a scarf. All the flats on the router cutter make weak
joint-planes that are perpendicular to the panel faces.
You would minimize the effect of that if you designed cutter profile
with two 1:12 side-angle fingers (9.53 deg included angle), with
1/16"-wide flats on their tips and between them. That puts a 1/16" flat
at center of the joint, and a 1/32" half-flat at the surface on each
face of the panel.
Thats an all-in-one cutter. You would raise and lower it in the router
table as required to get the matching male and female profiles. You
could make separate male and female cutters for each plywood thickness,
the male with one finger and the female with two.
With the fingers having 1:12 side-angles, they are 2-1/4" long and have
a long, thin shape. If you place finger profile on a cutter so its
inboard end is at the 3/4" diameter, the cutter has a 2-5/8" overall
diameter. What rpm would you turn that at?
Bill
-----Original Message-----
From:richard@...[mailto:richard@...]
Sent: Tuesday, December 04, 2001 5:30 PM
To:bolger@yahoogroups.com
Subject: [bolger] finger joints vs scarphs
A finger joint would seem to be a lot of little scarph joints. Made
up good boards in the lumber yard are joined with finger joints.
http://www.jesada.com/australia/instructions/finger_joint_instructions
.html
It would seem you would save a lot of expensive wood if you could use
the bit above instead of making a scarph.
Anybody have any idea of the relative strengths of finger joints vs
scarphs?
Yahoo! Groups Sponsor
ADVERTISEMENT
<http://rd.yahoo.com/M=178320.1681224.3270152.1261774/D=egroupweb/S=1705
065791:HM/A=879173/R=0/*http://www.fastweb.com/ib/yahoo-76f>
Bolger rules!!!
- no cursing, flaming, trolling, spamming, or flogging dead horses
- pls take "personals" off-list, stay on topic, and punctuate
- add your comments at the TOP and SIGN your posts, snip all you like
- To order plans: Mr. Philip C. Bolger, P.O. Box 1209, Gloucester, MA,
01930, Fax: (978) 282-1349
- Unsubscribe:bolger-unsubscribe@yahoogroups.com
Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service
<http://docs.yahoo.com/info/terms/> .
[Non-text portions of this message have been removed]
A finger joint would seem to be a lot of little scarph joints. Made
up good boards in the lumber yard are joined with finger joints.
http://www.jesada.com/australia/instructions/finger_joint_instructions
.html
It would seem you would save a lot of expensive wood if you could use
the bit above instead of making a scarph.
Anybody have any idea of the relative strengths of finger joints vs
scarphs?
up good boards in the lumber yard are joined with finger joints.
http://www.jesada.com/australia/instructions/finger_joint_instructions
.html
It would seem you would save a lot of expensive wood if you could use
the bit above instead of making a scarph.
Anybody have any idea of the relative strengths of finger joints vs
scarphs?