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Anyone have a JD2 model 3, 1.5"x4.5 die?

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juanni

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Discussion starter · #1 ·
I am making a 1.5" x 4.5R tubing die for my JD2 model 3 and really struggling to get the geometry right.

So, anyone have that die set that can measure a few things and help me out?

Thanks!!
 
Discussion starter · #4 ·
Subybaja said:
I don't have one, so this is just a bump...

What's your plan? Stacked plates, next-size bent tubing...?
Click to expand...
Machined from solid stock with a welded together follower.



I Lean said:
Yep, I have one. What do you need?
Click to expand...
OK, great!
1st off 1.5" tube, 4.5" radius uses hole #5, correct?

I need these dimensions.


A, the length of left pad.
B, the length of right pad.
C, distance from left edge to left edge of pad.



D, distance from edge of 1st drive hole to die edge.


The problem I am having is, after I line up everything correctly, either my swing arm is in the way to prevent using hole #5 or if I move the swing arm then the dies are no longer in the correct geometry to each other.
So I am not sure what is off?

Thanks!!
 
Discussion starter · #5 ·
I also am making a 1"x 3R, 1-1/4"x4R and a 1-3/4"x5.5R die sets and could use the same info as above for making them.

General question, since I don't have any factory dies I am wondering when you assemble a tube in the bender, with the u strap on, BUT before taking up the slack and bending, How much clearance is there between the drive pin and the frame?
Does it barely fit in?
 
#6 ·
You are correct, hole #5.

A = 1.45"
B = 1.45"
C = 3.51"
D = .395", and it is just over a 1" hole. (like 1.05")

You didn't ask, but the hole in the follower is approximately .9", and it is .305" from the edge of the hole to the edge of the material of the follower. The edge is about .19" from where the tube would be at it's closest point. (I placed a straightedge across the followers where the tube goes)

I don't have a JD2 bender, I have a vertical one I made myself--but the die drive pin does touch the main frame sometimes when it's fully retracted.
 
Discussion starter · #7 ·
OK I Lean, my A and B were within 0.1 but C was about .5 too long.
Knocked it apart, remachined it and tacked it up to match your dimensions.


Ignore that 95 degrees, it should be 85.

Still I think something is off.
Approximately where is the center of the follower block hole in relation to the lower right corner of the left pad?

What do you have for dimension E on the strap?



This is a picture of how I think the tube, die and follower should be in relation to each other, according to the JD2 manual figure 10, page 5


However, look at how the strap arm is at such a severe angle.

You guys with model 3 benders, is that how yours line up with tension but before bending?

I assume that arm is supposed to be welded at 90 degrees to a radial line from the center of the die.

Thanks all!!
 
#8 ·
Follower hole is centered pretty close to 1" to the right, from the RH edge of the left follower. Looks essentially centered between the two blocks.

U strap dimension E is 2.18". Although, I have seen those straps stretch over time and affect the beginning of the bends--which doesn't seem to matter at all to the quality of the bends.

The one thing I can see different when mine is tensioned in the frame, is that the follower blocks don't line up with the edge of the die, like you have it in your pic. My follower sits back about .580". Again, that shouldn't really matter to what you're concerned with though. As long as you can fit all your parts together and get a bend going, I think you'll be OK. The start-of-bend point is not the very corner of the die, it's back a bit.
 
Discussion starter · #10 ·
Yes, I expect the die to rotate and take up the slack while tensioning the tube which would make it ahead of the follower 1/4" or so.

My strap is within a few tenths of yours so that should be close enough.

About the only think left is the strap arm welded to die. I must have that at the wrong angle because yours and every other pic I see has the tube parallel to that strap when tensioned.
Mine is at a severe angle, which makes the strap not long enough.

Image


Mine is at 90 degrees to a radial line from the center pin hole.


Could I please get a pic of your die, so I can see what angle it is attached at.

Thanks!!
 
Discussion starter · #12 ·
Oh, that is what they did.
I cut on a radial line and welded the arm 90 degrees to that.
They cut a line parallel to a radial line 3/4" or so over from where I did and that is why their arm is parallel to the clamped up tube and mine is Mr Droopy.

Thanks I Lean!!
 
Discussion starter · #13 ·
Well, finally got that 1-1/2" beat.

Bends look real nice.



Got the info needed for the 1" die with 3" radius, but still need the same info on the follower for a ...
1-1/4 tubing with 4" radius set.

Anyone?
 
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