Nothing new, but I thought I could show how I put this thing together.
First a picture of the bow form using air hose. For this form I had a steel template made with a computer guided laser cutter. The finished form have a 16 inch straight center and then it goes into a true circle curve. For a 68 inch bow the nocks will be 1 inch backset.
Then a picture of the heat box using an old kind of flanged pipe heater. The thermostat is from an old water heater tank.
The laminates to be used are from the back, clear Bjorn glass, Elm parallel flat grain, Stabil-kore, Elm parallel edge grain, Pernambuco riser 15 inches long, Elm taper .003 forward taper that goes into a .004 reverse taper 7 inches before nocks and clear glass.
Awesome :thumbsup: Your stack sounds well thought out. Both Elm lams going to be the same thickness?
Flem you asked to see the bowform in use, here it is pumped up on a dry run. When gluing up I use several zip ties on top of metal strip to hold lams in place. Pump up to 20 pounds and let it stay a few minutes, then up to 30 pounds and remove zip ties. I then pump it up to 60 pounds. I use that much because of the steep riser ramps. One time I forgot to remove zip ties, but since they were on top of metal strip it was fine. I remove the barclamp when it is pumped up.
Making a small jump forward. Here it is out of the form ground parallel, Pernabuco riser and Elm flat grain under clear glass. The Bjorn glass is sanded on both sides and is .036 inch thick.
That will be all for tonite, 01.30 in the morning now. Old Bue need his beauty sleep.
:goldtooth:
That is a seriously nice setup! :o :o
Actually I was curious about the thickness of your belly lam compared to the back lam?
Flem. If you mean the two Elm lams on the back of the riser the flat grain is .090 and the edge grain one is .105.
Nice, Bue..
Quote from: Buemaker on December 22, 2021, 04:54:04 AM
Flem. If you mean the two Elm lams on the back of the riser the flat grain is .090 and the edge grain one is .105.
Flem... That means the edge grain one is .015" thicker than the flat grain one... :laughing:
Looks like somebody got a new calculator for an early gift :goldtooth:^^^^
I would have guessed the flat grain lam to be the thicker of the two
Good comeback... :laughing: :laughing:
Looking good so far, Bue. :thumbsup:
Bue, did you loose any backset off the form?
Flem, almost nothing, perhaps 1/16 on each tip.
Some small progress made. I put saran wrap on the handle and tips and glue up riser and tip overlays before gluing them on the bow. Then I can grind the ends so I do not sand into the glass. Handle overlay is glass and a strip of Pernambuco. Tip overlays is 4 pieces of 1/16 inch thick pieces of linen Micarta.
Roughly ground to width, leaving the tips a bit wide for any needed adjustments. Tips just rough.
:thumbsup:
Good job on the pictures Bue...
Lookin good bue!
8 inches wide sanding belt cut to make a long sanding table for fine adjusting.
Not so much being done during Xmas.
Bue I like your way of thinking. Now I only have to find a long flat table.
Quote from: OldRawhide42 on December 25, 2021, 10:17:26 PM
Bue I like your way of thinking. Now I only have to find a long flat table.
I used a solid core door from Home Depot... They are pretty flat... Gotta build a frame with legs and then shim to flatness...
Good deal Bue...
How's the bow coming along Bue?
Not been doing so much lately, Arthritis working in these old hands. Have the bow finished except finish sanding of nocks and spraying. Here pics at brace and at 28» Will post some specs under this pictures.
Very nice, Bue..
Looking good. JF
The shelf is 1 1/2 above bow center, even tiller at end of fade outs and at 15, 20 and 25 from bow center. Tiller at 18 inch draw at the same distances is still the same on both limbs. Bow width at end of fadeouts is 1 1/4 tapering in straight lines to 1/2 inch just before nocks. It came out very light, but is a pleasure to shoot and dead in hand so I think the taper rate and design is good. Both limbs have same lenght from fade outs and 67» between nocks. I really missed weight on this one and it goes to show that small changes make a large difference. I made bows on this form years ago and from old notes I took I can see that with 16 inch riser 68 between nocks,maple lams, Exel glass from Finland .040 thick, total .0015 straight taper and a total stack thickness at end of fade outs at .370 that bow came out at 40 pounds at 28 draw. On this new one I used a 15 inch riser, 67 between nocks, Elm lams, Stabil-kore, Bjorn glass .036 thick, .003 taper that the last 7 inches goes into a .004 reverse taper and a total thickness at end of fade outs at .382. This new one came out at 30 pounds at 28 inches draw. I'll post some pics when I get finish on it.
Beautifully classic straight bow there Bue! HH would be pleased, I think. And at 30#, it's just my draw weight! :clapper: :jumper: :archer2:
Lookin good :thumbsup:
I'm starting to deal with the beginnings of arthritis. One day I will be nothing more than a chunk of gnawed on, dried up, gristle.
One more. That Pernambuco wood has almost no pores and get almost like glass when sanded.
Sweet!
Looks Good, Bue... Always appreciate your work...
Finished this one. I think the Pernambuco and dark Elm looks good under the Bjorn glass. Glass and a strip of Pernambuco on back of handle.linen Micarta tips. I used dipping on this one.
One more.
You can bring that beauty to Florida and both you and the bow can have an "arthritis break" in our warmth, Bue. The bow could stay, but your visa would run out sooner or later!
Thank you Ken. Sounds temting, but a bit far to travel. I visited the USA a few times in my younger days back in the late sixties and early seventies. Bue.
Looks good Beu. JF
Very nice Bue.
Always nice Bue :bigsmyl:
Simple elegance, Bue. :thumbsup: