80/20 linear motion?

[RichardJames]

Our team uses 28mm extrusion, and instead of using any form of linear bearing we have always used a special delrin slider attachment which fits into the extrusion and acts as a linear bearing (as delrin is self-lubing). the advantage of this is that there are no moving parts really like in bearing, and it gives a more solid connection the more the delrin and aluminium overlap.

please excuse lack of pics. can`t find my CAD files.

[Mike Norton]

http://www.valleytech.k12.ma.us/Robo...2005UCFReg.htm

if you go here we used 60mm x 30mm for the tower and 30mm x30mm for the arm. it was very strong and used a special delrin. we had no problems with the sticking.


You can see we went vertical and horizontal with this system.

we went out 36" from the front and went up 14'

[Daru]

In 2005, I believe we used 80/20 linear bearings. We never had a problem with them binding, even with the tetra up 12 feet pulling on our bearings. I can't get you part numbers now, but I might remember to come back and get you them.

We found that the rail they slide on is very, very heavy, especially for the "light-weight" game of 2007.

Each peice we used was over 5 pounds.


We're planning to use a similar system to lift tubes this year. We have plans to improve on it, and to make it much faster (full travel in less than one second (/me crosses fingers)) and lighter. We're only moving a pound of tube

[lukevanoort]

We were considering the 80/20 linear slides, can anybody have a rough price for them?

[KTorak]

You're going to have to speak with your local 8020 distrubutor. There are several threads about this, including a few regarding linear motion solutions.

[Ben Piecuch]

Here are the part numbers and prices of the 8020 slides we've used in the past years. These prices are from 2005, so they have probably changed +10-20% or so... Also, we've been receiving a 50% discount over the past few years.

All of these parts are compatible with the 1010 extrusions.

6760 - Single UniBearing - $12.50
This comes with all the necessary pieces. We used 4 per stage (2 on each side of the extrusion, 2 on each end of the elevator stage) Extra glides are as follows:
6790 - Single Keyed White Bearing Pad - $1.80
6780 - Standard Shim Stock - $2.60
6792 - Double Keyed White Bearing Pad - $2.85

The sliders listed below can also be used as an alternative, depending on how you're bolting additional pieces on to your stage, or if you need a longer bearing.
6762 - Single UniBearing (4") - $16.00
6715 - Single Flange Linear Bearing (2") - $32.50
6716 - Single Flange Linear Bearing (4") - $42.90

Oh, other people were wondering where to purchase this material. Goto www.8020.net and use the distributor lookup tool. This is the only way (I know of) to purchase the material. Turn-around time in a couple days. ALL of their parts ship from Indiana, as the distributors don't really carry much stock. Feel free to PM me or ask more questions here on the forums. I'm happy to help!

BEN

[sdcantrell56]

This is a question for Mike Norton from team #61. Specifically what did you use for your slides for the lift. I can't tell from any picture. Do you have any pictures of the slides.

[Justin M.]

Originally Posted by sdcantrell56

This is a question for Mike Norton from team #61. Specifically what did you use for your slides for the lift. I can't tell from any picture. Do you have any pictures of the slides.

The slides used I believe are the 80/20 UniBearings. These come in a wide variety of styles, Doubled, long, and can fit any type of 80/20 (1010, 1515, and metric sizes). Check the catalog for more details.

[sdcantrell56]

I have been looking at the pictures that they have posted and I don't see any of the unibearings or any bearings for that matter. If I can figure out what they used for the slides, then I can easily cut about half of the weight out of our elevator.

[Mike Norton]

for bearings we used Profile slider made by Bosch they are made of delrin.

if you want a stronger one you can go with slide bearings which are thicker but they do not have the center cut out for the t-block.

we get our stuff from Minuteman controls Wakefield MA 781-245-9550

sorry for the late reply had a busy weekend

I hope this works for you

[sdcantrell56]

Thank you so much. Do you happen to know the part numbers.