Author Topic: T/D recurve help-along (Read 16486 times)

Balding Kansan · « **Reply #40 on:** August 28, 2021, 07:59:13 PM »

Yes sir, I checked. All good.

Mad Max · « **Reply #41 on:** August 28, 2021, 09:18:44 PM »

Awesome

Balding Kansan · « **Reply #42 on:** August 29, 2021, 09:10:09 PM »

The hose plugs came in so I got my air hose setup. It took some finagling to get the clamps to where it wouldn’t leak.

Do you guy typically put a laminate strip on the top of your form or did I dream that up?

Crooked Stic · « **Reply #43 on:** August 29, 2021, 09:19:43 PM »

The top does not need a strip. but on each end I round off so there are no sharp spots that could puncher your hose.

Balding Kansan · « **Reply #44 on:** August 30, 2021, 08:25:31 AM »

Thank you.

How much gap do you gents aim for between the top and bottom form?

And how much air pressure? I put 25 pounds on it to test and it’s rock hard, but I was thinking 60 was where I needed to be? 60 seemed dangerous!

Mad Max · « **Reply #45 on:** August 30, 2021, 09:54:22 AM »

What stic said

1" is how I do mine, drill and bolt you hardware on first and then mark 1" and band saw it.
Your dry run will tell you how much pressure, 40/50psi is plenty.
put 50 psi in the hose and stick the ends in a bucket of water and look for bubbles

Shredd · « **Reply #46 on:** August 30, 2021, 12:19:27 PM »

What Mark said... About 1" between forms... You want the cross section of your air hose to resemble an oval racetrack... You don't want a dog bone shape...

Balding Kansan · « **Reply #47 on:** August 31, 2021, 08:32:08 AM »

Got it set at an inch. I got off a little at the butt end so it’s more like an 1 1/8” but I was hoping with the wedges in that area it won’t make much of a difference. I’ll track down some steel straps and bolts to get it coupled together.

How much do you shim out the steel to get it to clear the air hose? I was thinking a 1/4” each side, maybe more?

kennym · « **Reply #48 on:** August 31, 2021, 08:54:25 AM »

I use 1/2" plywood (it's a bit less ) so it doesn't bunch the hose there.

I bevel the top of the ones on bottom form to make it easier to set straps down over.

I would put something to hold lams in line with form. I use fender washers drilled off center so you can just swing them up and tighten the screw.

I don't worry about the tip end , only both ends of wedge and mid limb . You will grind off the edges at the tip anyway.

Shredd · « **Reply #49 on:** August 31, 2021, 06:03:58 PM »

Remember there is gonna be play between your bolts and holes... Drill holes square on a drill press... Bolt your straps to one half of the form with the straps pushed up hard on the bolts when tightened to replicate the straps under pressure of air hose... Now mark out the holes in the strap on the other half of form... Allow for play in the bolts and holes...

Mad Max · « **Reply #50 on:** August 31, 2021, 06:57:43 PM »

What Kenny and Shredd said

Balding Kansan · « **Reply #51 on:** August 31, 2021, 11:19:06 PM »

I follow fellas, feeling pretty good about it so far. I need to add the little swing washers to keep everything in place, but I got the straps on tonight.

Balding Kansan · « **Reply #52 on:** September 01, 2021, 09:06:52 AM »

I was contemplating not building an oven, but after reading the EA 40 specs it sounds like it really helps out the epoxy properties. But it’s also confusing that it says to cure at room temp, then go into the oven. I thought most of you guys went straight into the oven with wet glue?

Mad Max · « **Reply #53 on:** September 01, 2021, 09:24:28 AM »

Those 3 black screw are not going to work, open up the 2 lower holes and use bolts and 1/2" plywood.
In the hot box cut time off. Does your truck get hot inside, start early in the morning and put it in there, put some cardboard under it and take it out the next day.

Balding Kansan · « **Reply #54 on:** September 01, 2021, 09:27:18 AM »

Yeah I don’t like the screws either. I actually bought lags for it but they weren’t long enough. Thanks for the tip, I’ll get them swapped out.

Mad Max · « **Reply #55 on:** September 01, 2021, 09:28:11 AM »

kennym · « **Reply #56 on:** September 01, 2021, 06:38:20 PM »

I put the same thickness plywood on the bottom form and use a 1/2" bolt thru there. May not need it but that's how I started out...

Shredd · « **Reply #57 on:** September 01, 2021, 07:58:18 PM »

Quote from: kennym on September 01, 2021, 06:38:20 PM

I put the same thickness plywood on the bottom form and use a 1/2" bolt thru there. May not need it but that's how I started out...

1/2" Bolt all the way... Anything less will bend...

Balding Kansan · « **Reply #58 on:** September 01, 2021, 08:45:35 PM »

The picture is deceiving. There’s 1/2” ply under the bottom straps. I don’t like how narrow I made them so when I switch out the wood screws I’ll make some bigger 1/2” pieces. I found some longer lags. (2) 1/4” diameter lags per strap you think will bend? I’m happy to switch to bolts if you think so. I guess my thought was (2) 1/4’s should have the same properties as (1) 1/2.

Thanks for all the feedback! Appreciate it.
No work on the form this evening, family is getting upset at my absence in the evenings!

Mad Max · « **Reply #59 on:** September 01, 2021, 09:00:21 PM »

Go with one 1/2" like shredd and Kenny said

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Author Topic: T/D recurve help-along (Read 16486 times)

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