JD2 will not bend past 130*

[Chris]

Using my bender manually I cannot get the ratcheting mechanism back on the pin once I get past around 120*. I can fight with it and get it to go up to 140* but there's no way to get it past that. The benders is about a year old and has been used twice and the 1 3/4", 5.5 clr die is brand new. Anybody else having this problem?

[Gouky]

tighten the bolts holding the top and bottom plates together. they flex a bit and end up absorbing a bunch of the energy. i actualy welded a plate between the two and it bends a million times easier now.

[Beat95YJ]

Sometimes I pull or push on the bent end of the tube and is does help.

[Chris]

Sometimes I pull or push on the bent end of the tube and is does help.

THis works to get a couple more notches but it gets to the point where it just won't go anymore.

[Arya Ebrahimi]

Just a wild ass guess here, but are you sure you have the two main arms of the bender assembled correctly? In other words, there is a top and bottom, are you sure you have the top facing up? (TOP is actually stamped into one of the arms)

Ary

[Southbound_Pachyderm]

tighten the bolts holding the top and bottom plates together. they flex a bit and end up absorbing a bunch of the energy. i actualy welded a plate between the two and it bends a million times easier now.

Could you snap a pic of this set up?

[fabcam]

Have you talked with JD2?

[Chris]

Just a wild ass guess here, but are you sure you have the two main arms of the bender assembled correctly? In other words, there is a top and bottom, are you sure you have the top facing up? (TOP is actually stamped into one of the arms)

AryI could check but I've not had a problem until now, of course this is the first time I've bent this far.

Fabcam, I put in a call to them this morning.They say I may need an anti spring back kit. I hope that's not the case.

[dvsjeep]

Are you using a 120deg die by any chance?

[fabcam]

If you could put up a couple of pics, it might help.

[traxman25]

I could check but I've not had a problem until now, of course this is the first time I've bent this far.

Fabcam, I put in a call to them this morning.They say I may need an anti spring back kit. I hope that's not the case.

That most likely is the case. Or just a hyrdo ram...

[Chris]

Are you using a 120deg die by any chance?

I really want to believe I'm not that dumb. Not that I haven't been in times past, I just don't think I am this time. I'll get some pics tonight when I send them to JD2.

[Wicked_S10]

Are you perchance bending a different type of tube then before, or purchasing from a different mill or vendor? I have full hydro on my 105HD and bend mostly CREW tube with it, I bought a shit load of DOM from a different supplier, same diameter and wall thickness, and it would stall my hydro about 10-15* bellow full travel. I re-pin to give it more mechanical advantage, and can keep going, however, it is entirely possible that I wouldn't have been able to manualy bend it that far.

Side from that, I would tend to guess something is bent. I have bent both the main 1" die pin on my bender, and the 7/8" follow block pin. Pull all the pins and check them over closely. Roll them on a flat surface and watch for run out, or better yet, chuck them in a DP, Mill, or lathe and check with a DTI.

Later,
Jason

[Chris]

Are you perchance bending a different type of tube then before, or purchasing from a different mill or vendor? I have full hydro on my 105HD and bend mostly CREW tube with it, I bought a shit load of DOM from a different supplier, same diameter and wall thickness, and it would stall my hydro about 10-15* bellow full travel. I re-pin to give it more mechanical advantage, and can keep going, however, it is entirely possible that I wouldn't have been able to manualy bend it that far.

I don't know. I've never bent this far with this bender.Everything looks good to me. None of the pins are bent. Everything looks like it's in the right place

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[Arya Ebrahimi]

This is going to sound really shady, but I had a piece of 2" 3/16 wall one time that would spring back like a mofo. At one point to be able to engage the next hook on the ratchet I had to cut a length of scrap and wedge it between the two main swing arms of the bender to keep it from springing back while repositioning the ratchet.

However I have bent many many pieces of 1.75 .120 wall HREW and DOM with a 5.5" CLR die like you have, and have never had the same problem. Dunno what to tell you.

[Wicked_S10]

How long is your handle for the ratchet mechanism? Maybe you just need a longer lever. If you can no longer bend, and you still have ratchet travel left, as shown in the picture, either something is binding very badly (unlikely if it bends smoothly up to that point) or you are just not strong enough to keep going. A longer handle will give you more mechanical advantage, and allow it to go on... Or break, if it is bound up. At least you'd find the problem, right :D

I know the Pro-tools dies and JD2 dies are made to different angular measurements, but that die is much, much shorter than my 240* Pro-tools dies. Perhaps it is a 120* die after all?

Later,
Jason

[fabcam]

I know the Pro-tools dies and JD2 dies are made to different angular measurements, but that die is much, much shorter than my 240* Pro-tools dies. Perhaps it is a 120* die after all?


Its definitely the JD2 210* die.

[fabcam]

Your not putting the "U" strap through the die hole, are you?

[guidolyons]

I know the Pro-tools dies and JD2 dies are made to different angular measurements, but that die is much, much shorter than my 240* Pro-tools dies. Perhaps it is a 120* die after all?

Later,
Jason

Its definitely the JD2 210* die.
Fabcam-you mean 120*?
Looks like a 120* die to me, IIRC the JD2 dies 120* or 240*, the website now shows that they are all 180* dies now. The 240* die looks like "Pacman"

Obviously if it's a120* it won't bent more that that.

[Pt_Ranger_V8]

'nthing the 120* die, hence why it won't go father

[TRD]

die looks just like mine - 180 degree

[Chris]

It is a 180* die, No I put all the pins in the right holes. I've been married a while, I'm good at that. :D

[Chris]

How long is your handle for the ratchet mechanism? Maybe you just need a longer lever. If you can no longer bend, and you still have ratchet travel left, as shown in the picture, either something is binding very badly (unlikely if it bends smoothly up to that point) or you are just not strong enough to keep going. A longer handle will give you more mechanical advantage, and allow it to go on... Or break, if it is bound up. At least you'd find the problem, right :D

I am using a short handle but I am out of handle travel.

Your not putting the "U" strap through the die hole, are you?


No, It's just sitting there. I'm reasonably confident in my mechanical ability, I'm sure I have everything in the right spot.

[fabcam]

Lets hope that Anti Spring Back Block does the trick.

[fabcam]

Fabcam-you mean 120*?


No, I am sticking to 210*. The die is cut straight across and the 210 degrees is from the center of the die out to the ends. Doesn't look like a PacMan any more.

Here is a little picture for ya:
http://vansantent.com/images/mod3_die.gif


Picture is from www.tricktools.com

[guidolyons]

No, I am sticking to 210*. The die is cut straight across and the 210 degrees is from the center of the die out to the ends. Doesn't look like a PacMan any more.

Here is a little picture for ya:
http://vansantent.com/images/mod3_die.gif


Picture is from www.tricktools.com


No problem, I was trying to clarify, I didn't know if it was a typo or not, I hadn't seen a pic of the new dies and it thought it might be the older style.



You da man.

[Chris]

Lets hope that Anti Spring Back Block does the trick.You have a picture of what that looks like?

[Chris]

How hard is it to bend chromo by hand? I'm thinking I may have gootten some by mistake. The steel yard I buy from screws up on a regular basis. The tube I have has no seam and no lettering on the side but is much darker than your average DOM. I know that doesn't mean a whole lot but that would explain some of it. Gonna try and bend some known tube tonight.

[Triaged]

You have a picture of what that looks like?Think of the sliding end of a pipe clamp like the pic below if you want to make your own for cheap.
http://ec1.images-amazon.com/images/I/619X8QY6Q9L._AA280_.gif

There is a small hard to see pic of the JMR version here
http://vansantent.com/tube_bending_machines/JMR_Manual_benders.htm
http://vansantent.com/images/ASB100.gif

[Chris]

Well, Jd2 didn't really see any problems so they are sending me a pin and a picture to make an anti springback kit. :beer: to Paul at JD2.

[fabcam]

Well, Jd2 didn't really see any problems so they are sending me a pin and a picture to make an anti springback kit. :beer: to Paul at JD2.


I think that will take care of it.

Cris

[Chris]

Well, I though they were sending me the spring back kit but instead they sent me a new ratcheting arm that has the notches set back further in relation to the end of the arm. We'll see how it works.