Need leads for HDPE rollers with bearings

[racerone3]

all I did on mine is open the ID of the roller up another .010" . they were binding on the shaft a little once they got hot, so hopefully opening them up will give them a little room to expand when they get warm.

[micmac]

Race,

I looked a the catalog and there looks to be some promise there. I haven't had the chance to call them yet but I'll let everyone know what I find out. I'm curious as to the modifications you made. Please keep us updated.

Mike

[thebuggyman1]

I bought UHMV polyethylene round tube 1 3/8 OD 5/8 ID from mcmaster carr for $7.20/ft .
I'll let you know how it works.

[racerone3]

Mike, not sure if you are still searching, but here is a lead on rollers. Econobelt Handbook of Timing Belts and Tensioners - Q450 Databse

the ones I made got modified slightly after the ride at George's this summer, and will get another test at Busco next weekend. if I'm happy with how they work, I'll have Shawn work up a price per unit for me.

[MarshallEpp]

just a thought that kinda looks like a skate board wheel. i wonder?

[micmac]

Thanks Joe I'll check it out. I was planning on HDPE as that's what the originals where made of. If there are better materials I'd be game to use them

Mike

[racerone3]

Joe, I'm not sure the actual makeup of the stuff we used, but it is ultra high wear. we use it for skid stops on the race cars. you can drag it on the track for 500 miles and only see a sixteenth of wear. we went to this from a product called Jabrock because this stuff is also very low friction.

it's probably overkill for my application, but it was in the rack!

[JoeMeg]

micmac go to mcmaster.com and search for cat. pg. # 3498 it is an overview of polyurethane type matl's. I know this stuff is much "softer" than Nylon/Teflon/Delrin. Not sure how it would fare in a chain tension roller application as opposed to say, Delrin. Joe.

[JoeMeg]

Also, for a little more info (confusion,decisions that need made) go to mcmaster.com and search for 8747kac it's some tech data. Joe

[JoeMeg]

" I had to pay for the stick of Delrin ($67 for 14 inches) "
Brian, not sure exactly what grade of Delrin was avail but here are a few popular choices around my shop. McMaster/Carr 8576k29 is 2" dia. @ $ 16.46/ft. and a glass filled resin grade 8719k17 2" dia. is avail @ $ 42.69/ft. I believe deliery on a credit card purch. is aprox. $ 5.00. Not a huge savings, but $ is $. Joe.

[Mike]

Those look very good Brian.

[racerone3]

here are my finished rollers. ended up only needing to go 0.004 bigger on the I.D. of the Roller than the O.D. of the bung to get them to roll nice and smooth. Shawn (my "work for beer" machinist) is working on getting a price per unit for those interested in a set. I had to pay for the stick of Delrin ($67 for 14 inches) and he did the work for me. we are also going to look at other materials for both price, and function reasons although i think the Delrin is going to work out really well.

[micmac]

Don is right. Plus I don't have enough clearance between my mounts and linkage for the t-20 shifters on the drive chain as well.

[Don]

I think Micmac's running into the same problem I am, Lewis. On the rear chains of the Hustler there's not enough room between the frame rails and the bottom of the body to use even a thirteen tooth idler. The original rollers aren't that good and tend to crumble after a while.

[lewis]

I know you probably have thought of this but here goes. Why not a sprocket at this position? There must be a reason why you are using the Teflon? Workable space limitations or are you trying to get away from using so many sprockets? I am not so familiar with the style machine you have.