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JD2 Model3, Pro-tools 105, and JMR Benders Compared
JD2 Model3, Pro-tools 105, and JMR Benders Compared
Published by KeithXtreme
02-28-2007
Arrow Main Arms



The main arms of the benders are where most of the strength primarily comes from. There are a few similarities and differences between the Model3, JMR's and Pro-Tools 105std and HD.

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Both the JD2 and Pro-tools benders use the same hardware to mount the bender main arms. This consists of .75 Bolts with Nuts & Washers, 1 OD Frame spacers, and .75 Nuts and Washers. JMR use a .75" Bolt and a .625" Bolt with Nuts & Washers, 1 OD Frame spacers, All three models have mounting holes, which are 2 center to center, this means a stand from any of the companies would work on the others bender.

Model3 Main Arm specs:

Length 16.250
Widest Width 3.50
Thickness .500
Mounting holes 2 center to center
Tubing Capacity: Round tubing and pipe from 1/2" to 2" O.D. and square tubing from 1/2" to 1-1/2"

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105STD Main Arm specs:

Length 18
Widest Width 3.00
Thickness .500
Mounting holes 2 center to center
Tubing Capacity: Round tubing and pipe from 1/2" to 1.75" O.D. and square tubing from 1/2" to 1-1/2"

105HD Main Arm specs:

Length 18
Widest Width 3.00
Thickness .625
Mounting holes 2 center to center
Tubing Capacity: Round tubing and pipe from 1/2" to 2" O.D. and square tubing from 1/2" to 1-1/2"

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JMR Main Arm specs:

Length 18
Widest Width 3.115
Thickness .593
Mounting holes 2 center to center
Tubing Capacity: 2-1/2" Round Tube, 2" Square Tube,
2" Sch 40 Pipe Capacity

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You will notice that the thickness of the JMR Main arms is not a full 5/8" thick. This because JMR uses a proprietary Heat Treated Alloy and then blanchard grinds both their main arms and their swing arms, providing a very true surface.

The thinnest part of the main arms is a little difficult to measure on the model3, because there is a backing block pin hole located very close to the main frame pin. The thinnest portion of the arms on the model3 was measured at 1.875 and measured at 2.250 on the Pro-Tools 105 and JMR Benders. But as you can see in the photo below, from an engineering stand point the thinnest part of the model 3 arms would be the last pin hole before the main pin, this measurement is 1.

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The photo above also shows, the lower frame link mounting point, which the Model 3 degree plate installs upon.

Backing block pin holes on the Pro-tools 105 and JMR Benders are .125 apart and .375 apart on the Model3, combine this with different drive pin locations on the dies and this means that dies are not interchangeable between JD and either Pro-Tools or JMR. But the dies from Pro-tools and JMR are interchangeable.

The 105 has a groove machined into the lower arm to accept a washer, that when greased allows the swing arms to move freely. The lower main arm and the swing arms on the 105 do not make direct contact.

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The Model 3 does not have this and the main arms and swing arms have direct contact. JMR has gone a step further and installed aluminum bronze bushings in the main arms and the swing arms that prevent the arms from direct contact. This in turn performs two function, prevents the arms from having direct contact with each other and prevents the swing arms from sliding out when the die in not installed. As seen in the photo's below.

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This mean that the main die pin is never in a bind and can be removed and inserted extremely easy.

A quick note on the finish of these benders, JMR Black Zinc Hard Coats their arms. While this provides a very nice and shiny finish, I did notice that in the assembly and conversion setup of the bender. It was very easy to scratch this finish. Pro-Tools uses a two part epoxy finish in black . This finish seems to be the most durable of the three companies. The bender that JD2 sent did not have a finish on any of the arms, it appeared to be just bare steel.

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Contents

<<  <    Next Page: Swing Arms (Page 2 of 8)    >  >>
  #1  
By KeithXtreme on 02-28-2007, 10:39 PM
Be sure to post up in this Review it is open to everyone!
  #2  
By Captainfab on 03-01-2007, 01:31 AM
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Keith, good job with this review so far, I'm looking forward to the rest.

At some point in this review could you demonstrate the proper use of the adjustable stop on the PT105STD? I haven't taken much time to figure mine out, but then again I haven't asked anyone either. I'm pretty sure I know how it works, but I haven't used it yet. I just thought it might be nice to show so everyone can see. Thanks for taking the time to do this review.
  #3  
By KeithXtreme on 03-27-2007, 06:30 PM
Its back up and ready for everyone.....
  #4  
By fabcam on 03-27-2007, 07:06 PM
all 3 side by side

First time I have heard of someone getting a chance to break down the nuts and bolts of each bender and seeing what they look like side by side.

Thanks for the review.


NOTE: For guests who are not members..... Sign up and be a member, the pictures are much easier to see.



.
  #5  
By TheBandit on 03-27-2007, 07:44 PM
That's a nice set of photos outlining the few differences among the benders. One thing that's been rumored is that the JMR and Pro Tools dies are interchangeable. Is this true?
  #6  
By fabcam on 03-27-2007, 07:46 PM
Quote:
Originally Posted by TheBandit View Post
One thing that's been rumored is that the JMR and Pro Tools dies are interchangeable. Is this true?
Yes

Quoted from the reveiw:
Backing block pin holes on the Pro-tools 105 and JMR Benders are .125” apart and .375” apart on the Model3, combine this with different drive pin locations on the dies and this means that dies are not interchangeable between JD and either Pro-Tools or JMR. But the dies from Pro-tools and JMR are interchangeable.
  #7  
By Rock4XFab on 03-27-2007, 08:51 PM
Keith the write up is very informative. I do have one question. Every die I have purchaced (all 240 for Pro-Tools) have had the tension block already welded to it. When I purchaced new follow dies They sent me ones with no block welded so I enquired. They Pro-Tools told me that on the 240 deg you get the block pre-welded, but it was not used on the 120 deg units although they are the same follow die, and if I had speified which die I had the new ones would have come with them. 2 days later the parts showed up for me to weld on. Great customer service..
  #8  
By KeithXtreme on 03-28-2007, 12:33 AM
That is news to me, Jim my sales person there had always told me they do not put them on unless 4130 was specified as a material you would be bending.

But over the years, Jim had just grown accustomed to adding it to all my die orders. So that is good info to have and just goes to show you the great customer service they have. I could not have the kind of customer service I have unless they backed me the way that they do.

I also try to keep a few of those tabs in stock for just such occasions.....
  #9  
By KeithXtreme on 03-28-2007, 01:51 PM
I just got off the phone with Jim, the owner of JMR and there are a few corrections to some of the statements in the comparison. I have changed them in the comparison, but I also wanted to post them here for a quick reference.

I originally said the dies from JMR where Steel Billet, they are in fact made from Cold Rolled Alloy Bar Stock and CNC Machined.

The finish of the JMR bender was quoted as being Hard Anodized, they are in fact Black Zinc Hard Coated.

I had a few questions today on those issues and JMR cleared them up for me.
  #10  
By Corban_White on 06-07-2007, 08:08 PM
so how's part two comming?
  #11  
By DevinSixtySeven on 06-07-2007, 08:37 PM
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Excellent writeup! Definately makes it easier for first-time buyers.

The only question I have relates to the listed capacities...they're stated as max OD, but not material or wall thickness. It appears from just the listed specs that the JMR can handle a 2.5" OD round tube, but is that HREW, DOM, 4130, and in what wall thickness?

Thanks very much,
Sean

**Found it with some web wheeling...JMR states 0.25 wall 4130, I'm having trouble finding a max capacity for the 105HD...anyone know offhand? Thanks!
Last edited by DevinSixtySeven; 06-07-2007 at 09:09 PM..
  #12  
By KeithXtreme on 06-07-2007, 09:08 PM
Quote:
Originally Posted by DevinSixtySeven View Post
Excellent writeup! Definately makes it easier for first-time buyers.

The only question I have relates to the listed capacities...they're stated as max OD, but not material or wall thickness. It appears from just the listed specs that the JMR can handle a 2.5" OD round tube, but is that HREW, DOM, 4130, and in what wall thickness?

Thanks very much,
Sean
I could not get any specs on the JD stuff for tubing, they always say call.....Pro-tools is .134 4130 and The JMR is .250 wall 4130 because it has the heat treated backing block......
  #13  
By DevinSixtySeven on 06-07-2007, 09:10 PM
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Quote:
Originally Posted by KeithXtreme View Post
I could not get any specs on the JD stuff for tubing, they always say call.....Pro-tools is .134 4130 and The JMR is .250 wall 4130 because it has the heat treated backing block......
So if I get this right (new at this stuff!), the difference in capacity is the die set, not the arms or pins, correct? So the 105HD could do a 2.0 OD .134 4130 if it were running hydro, or I had a herd of gorillas handy?

Thanks,
Sean
Last edited by DevinSixtySeven; 06-07-2007 at 09:13 PM..
  #14  
By KeithXtreme on 06-08-2007, 10:52 AM
Its a combination of both....you need nice thick arms to do 2" and the benders have to be made with enough clearance to fit a two inch die....

But yes you could do 2" on the 105hd .134 4130 with the breaker par they sell...it is not easy but you can do it....
  #15  
By KeithXtreme on 10-02-2007, 04:47 PM
The Pro-tools and JMR are very easy to bend manually with, because the swing arms are longer than the JD arms. As far as bend quality, they are all about the same, which is inherent on proper setup and the use lube....

What I wanted to test was the claims of .250 wall bending and just have not got to it.....As soon as I can get to it I will, thanks for your patience....Keith
  #16  
By shokid13 on 01-16-2008, 01:49 AM
Send them to me and I'll do the test!
  #17  
By TUBETEK on 02-03-2008, 11:00 AM
Whoa I just found out that I bought the (according to this article) best bender on the market. Wheww, I'm glad I did one thing right when I was just stareting out. Now I finally know that the grand I dropped on the bender and all the differant dies was woth it.
  #18  
By KeithXtreme on 02-03-2008, 03:31 PM
Which one did you buy? for the record.....
  #19  
By TUBETEK on 02-09-2008, 10:57 AM
I bought the m-tech bender, but I think its a knock off of the others. No special tooling on the pins, no laser on the degree wheel just a plain old bender that works everytime I use it.
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