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Thread: <<< Delrin Rear Bully Tubes >>>

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Old 08-05-2010, 05:41 PM   #21
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Mine arrived about 30 minutes ago. They really are well done. Hopefully I will get them installed tomorrow. Kenny....that is a great idea to sleeve the inner tube. I may follow your lead on that.....may hit McMaster tomorrow on my lunch to grab a few lenghts of aluminum tube. Great idea.


EDIT:

Going to grab a 6' length of this tomorrow:

http://www.mcmaster.com/#aluminum-tubing/=8a01xf

Like I needed another excuse to hit McMaster. I needed material for attaching the new trim router to the soon to be coming CNC machine anyway.

Last edited by xirtic; 08-05-2010 at 06:07 PM.
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Old 08-05-2010, 08:28 PM   #22
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That was fast. My tubes showed up today. Nice work...
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Old 08-05-2010, 10:39 PM   #23
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Great idea Kenny!!!!
One reason I love the people in this community is they are always looking for a way to make a great product better!!!!

I may have to implement that idea into the possible berg tubes on deck!
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Old 08-06-2010, 07:49 AM   #24
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I see McMaster carries tubes in stainless, brass, and alum that's .2812" OD...that's only .0017" larger that the ID of the Bully tube. The .250 tube would be a touch too small. It should be easy enough to "bore" out the ID of the Bully tube that tiny bit so that the sleeve tubing will have a nice interference fit when you slide it in.
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Old 08-06-2010, 09:16 AM   #25
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Originally Posted by Offroader5 View Post
I see McMaster carries tubes in stainless, brass, and alum that's .2812" OD...that's only .0017" larger that the ID of the Bully tube. The .250 tube would be a touch too small. It should be easy enough to "bore" out the ID of the Bully tube that tiny bit so that the sleeve tubing will have a nice interference fit when you slide it in.

I am leary about boring any material (although very slight) from these units. I just got back from McMaster with the 1/4" aluminum tube. There is a little bit of play, but I think that it will still be of a benefit in the event that the Delrin axle tube bends. I will try this method just as an added possible breakage prevention step. The .2812" material is probably the better choice. I will probably slightly flare the ends of this 3003 aluminum, and make certain that the aluminum tube just touches the bearing.
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Old 08-06-2010, 09:23 AM   #26
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Originally Posted by xirtic View Post
I am leary about boring any material (although very slight) from these units. I just got back from McMaster with the 1/4" aluminum tube. There is a little bit of play, but I think that it will still be of a benefit in the event that the Delrin axle tube bends. I will try this method just as an added possible breakage prevention step. The .2812" material is probably the better choice. I will probably slightly flare the ends of this 3003 aluminum, and make certain that the aluminum tube just touches the bearing.
I would think the delrin would flex and go back straight but if you put a thin piece of aluminum in there it might stay bent? Losi's are thin plastic and no one has problems with them.
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Old 08-06-2010, 09:35 AM   #27
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Losi's are thin plastic and no one has problems with them.
My MRC is 1/3 the weight of my 2.2 Bully.
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Old 08-06-2010, 09:53 AM   #28
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Quote:
Originally Posted by xirtic View Post
I am leary about boring any material (although very slight) from these units. I just got back from McMaster with the 1/4" aluminum tube. There is a little bit of play, but I think that it will still be of a benefit in the event that the Delrin axle tube bends. I will try this method just as an added possible breakage prevention step. The .2812" material is probably the better choice. I will probably slightly flare the ends of this 3003 aluminum, and make certain that the aluminum tube just touches the bearing.
Other optins could be to sand the OD of the sleeve tube a bit and see if that's enough to get it to slip inside....or even throw the .2812 tube into the freezer and see if it'll shrink up enough to slip inside.

.0017 is such a small amount.
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Old 08-06-2010, 12:15 PM   #29
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My thoughts are if you fall hard enough to break delrin you are gonna bend the aluminum.
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Old 08-06-2010, 12:24 PM   #30
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I am not sure why you guys are worried about the delrin tube. IMO, if anything is going to break, it will be where the tube mounts to the gear case. This was the same issue we had with the clod axles and why they required braces....
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Old 08-06-2010, 01:47 PM   #31
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I don't think breakage is gonna be a big issue?
We had one tube fail and it was on a really heavy rig that dropped off a ledge just "right" 1st thing to hit was the rear...I can tell you I have taken a few really hard falls...2 of of witch I would consider "big" falls at the rojo comp..mine did not break...
I know in "comp" you don't want to touch of save your rig most times...and I do not save mine in "comp"...but while regular practice running I would suggest not letting your rig fall off a five foot ledge and you should be ok...

These are strong tubes....but nothing that's plastic is bomb proof/cliff proof.
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Old 08-06-2010, 01:57 PM   #32
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Originally Posted by Chaotic Crawlers View Post
Great idea Kenny!!!!
One reason I love the people in this community is they are always looking for a way to make a great product better!!!!

I may have to implement that idea into the possible berg tubes on deck!
Paypal ready for Berg tubes
LOL
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Old 08-07-2010, 02:49 PM   #33
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I got mine in today....very nice work guys!



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Old 08-07-2010, 06:58 PM   #34
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Quote:
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My MRC is 1/3 the weight of my 2.2 Bully.
I meant the Comp Crawler. I ran my LCC at 6.2 lbs and i run my Bully at 5.75 lbs.
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Old 08-07-2010, 08:11 PM   #35
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I meant the Comp Crawler.
Haha....duh. Sorry, slipped my mind.

However, I agree with you. I dont really foresee a problem with these tubes...
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Old 08-09-2010, 08:42 AM   #36
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I am also paypal ready for Berg tubes. You need testers, right?
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Old 08-09-2010, 09:04 AM   #37
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Finding testers is the easy part!
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Old 08-09-2010, 09:06 AM   #38
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My thoughts are if you fall hard enough to break delrin you are gonna bend the aluminum.
Not true, the delrin is going to break at the gear case unless there is a nice raduis between the flange and the tube. I have broke delrin wheels and the aluminum tubes were just fine.
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Old 08-09-2010, 09:15 AM   #39
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Not true, the delrin is going to break at the gear case unless there is a nice raduis between the flange and the tube. I have broke delrin wheels and the aluminum tubes were just fine.
Agreed. That is exactly where I would expect the delrin to break. Only time will tell if that area needs to be beefed up. It shouldnt take much more effort to design a radius with countersunk screw holes if that does prove to be a problem.

BTW, I hear you on the broken delrin wheels. I've got two under my belt so far...

Last edited by JeremyH; 08-09-2010 at 09:19 AM.
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Old 08-09-2010, 12:11 PM   #40
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I meant my comment like if you fall hard enough to break the delrin the aluminum will bend because i don't see the delrin breaking. It looks like its machined from a solid piece and would handle some major abuse.
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