Author Topic: Recurve prototype (Read 3654 times)

ztontonz · « **on:** October 30, 2020, 03:09:20 PM »

I decided to start a separate topic with my 3 piece recurve prototype.

I put a string on after gluing tips overlays. I decided starting with a first set of string groove for a 61” bow. Hoping to add grooves further out on the curve later.
The bottom limb was twisting to the right.
So I started filling the left side of this limb and the tip groove on the right side. It did improve things but the limb is still not tracking correctly. Now it got me doubting myself.
Is this the right way to correct the twist or do you guys have a better way to do it?

Thanks,
Sam

Mad Max · « **Reply #1 on:** October 30, 2020, 03:42:46 PM »

Mad Max · « **Reply #2 on:** October 30, 2020, 03:54:31 PM »

With the string off I lay mine on the work table, mark with a pencil around the riser, measure up from the table to the centerline of the tip, flip it end to end and line up the riser to the pencil marks and check again.

I have some 5/16" dowels if you need them

Mad Max · « **Reply #3 on:** October 30, 2020, 08:12:20 PM »

With all that hook in it the string needs to be DEAD center.
Start the belly grove shallow and measure 10 or 15 times as you file it in. I use a 1/8" file first, then chainsaw file.
Looks off center close to the nock, that could be the problem.

Crooked Stic · « **Reply #4 on:** October 30, 2020, 08:53:41 PM »

Leave your tips wide starting out. I have had best luck by deepening grooves to get tracking good then even things up by narrowing the tips to the target width. Use stablecore also. and no more than .001 forward taper. Even no taper and work side profile if the tips are too stiff..
Never had much luck sanding the strong side. And side to side lam grind needs to be dead nuts on.
I dont file any belly grooves until I get the string landing dead center every time I shoot it during the tiller process. Be sure you string is not binding giving a false reading to.

Buemaker · « **Reply #5 on:** October 31, 2020, 10:01:23 AM »

Bill Howland said that before filing string groves he would shoot the bow several times with a light weight arrow and adjust if necessary until string was dead center and all was good.

Crooked Stic · « **Reply #6 on:** October 31, 2020, 10:22:00 AM »

Perzacly what Bue said

jess stuart · « **Reply #7 on:** October 31, 2020, 10:28:18 AM »

Tillering blocks can assure you find the true center of your limb. I find I fewer alignment issues since I have started using them. Stabilcore and less forward taper and wider limbs are all good ideas.

Shredd · « **Reply #8 on:** October 31, 2020, 12:04:27 PM »

Looking forward to see her at 28" draw and what her speed is...

Roy from Pa · « **Reply #9 on:** October 31, 2020, 05:19:23 PM »

Bue, how did he keep a string on it?

Buemaker · « **Reply #10 on:** October 31, 2020, 07:12:34 PM »

Roy. I guess my English is not correct, but with string groove I mean the one on the belly side of the recurve that the string rests in. The other ones I call nock grooves.

Roy from Pa · « **Reply #11 on:** October 31, 2020, 08:38:45 PM »

Recurveaholic77 · « **Reply #12 on:** November 01, 2020, 12:04:42 PM »

From what I see I agree with mad max looks like near the tip is off center!! Hope you get this worked out cause it looks like its gonna be an awesome bow when finished!! I had the same issue with a Ben Pearson Hunter that I have and it took me awhile to get the confidence up enough to do it but once I did it has been fine!!

ztontonz · « **Reply #13 on:** November 02, 2020, 05:02:25 PM »

So I spent some time looking at this over the weekend and I think I messed up something while drawing the centerline. Next time I will flip the bow and check on the other side like Max said.
Now I have to glue up a new limb before this project can move forward.

Thanks all for comments and tips!

Shredd · « **Reply #14 on:** November 02, 2020, 06:59:03 PM »

Before you make another limb... You may want to try moving one of the limb holes over to straighten out the limb... That way you can check how it bends and shoots before you move on... If you don't like these limbs you could tweak and make a whole new pair... Otherwise you are putting more effort into something that you may not be happy with...

Mad Max · « **Reply #15 on:** November 02, 2020, 07:12:39 PM »

Quote from: ztontonz on November 02, 2020, 05:02:25 PM

So I spent some time looking at this over the weekend and I think I messed up something while drawing the centerline. Next time I will flip the bow and check on the other side like Max said.
Now I have to glue up a new limb before this project can move forward.

Thanks all for comments and tips!

jess stuart · « **Reply #16 on:** November 03, 2020, 12:01:35 AM »

What if you filled the alignment pin hole and drilled it again after slightly moving it over to hopefully correct the misalignment.

ztontonz · « **Reply #17 on:** November 03, 2020, 09:46:02 AM »

Quote from: jess stuart on November 03, 2020, 12:01:35 AM

What if you filled the alignment pin hole and drilled it again after slightly moving it over to hopefully correct the misalignment.

The thing is my alignment issue is really in the curve section and not in the first 2/3 of the limb. So the hook is actually not square with the rest of the limb.
So I don’t see how moving the pin hole can help me with this.

ztontonz · « **Reply #18 on:** November 06, 2020, 02:37:33 PM »

Glued up a new limb last night

Mad Max · « **Reply #19 on:** November 06, 2020, 04:34:11 PM »

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Author Topic: Recurve prototype (Read 3654 times)

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