New AndyMark Wheels [Archive]

geomapguy

01-12-2013, 00:16

Has anyone seen these wheels before

https://www.andymark.com/product-p/am-2647.htm

I think they might be geared toward FTC but maybe they could also be used for FRC.

Any thoughts?

EricH

01-12-2013, 00:20

I think they might be geared toward FTC but maybe they could also be used for FRC.

Any thoughts?

Haven't seen or heard of them--but I do know that a number of FRC teams use 4" wheels as their go-to size. Most folks go with 6" wheels, or 8" wheels, but there are a few that go 4". I want to say most of the ones that do are using a modified WCD.

AdamHeard

01-12-2013, 00:21

They come in 1/2" hex, and 8mm key bore, so my hunch is they're intended for FRC.

They look like they could be used as a drive wheel, with a respectable amount of grip if their number is correct. Colson(ish) looks.

I ordered two to try out, you'll never convince me to not run nitrile roughtop for high traction setups.

They are VERY light for their size for such a durable looking wheel, so I'm interested in them for rollers, etc...

I'll post when we get ours.

cbale2000

01-12-2013, 00:21

4 inch wheels like this would be a little large for FTC if you ask me (though no doubt someone has/will try).

I could see the benefit for robots that use more than 6 wheels in a drive system (or just like them small) or perhaps for different grabber or shooter mechanisms. For the price I've considered getting our team some just to play around with and compare them to other wheels.

geomapguy

01-12-2013, 00:24

Haven't seen or heard of them--but I do know that a number of FRC teams use 4" wheels as their go-to size. Most folks go with 6" wheels, or 8" wheels, but there are a few that go 4". I want to say most of the ones that do are using a modified WCD.

We've been looking into using 4" wheels so we can get our CoG lower. Not sure about using WCD though. I'm not sure if these are the 4" hi-grips

wilsonmw04

01-12-2013, 00:28

if these were 3" wheels, we'd try them on our Octocanum. 1/2" hex with no need for a special hub? Yeah, I'd look at them over Colsons any day.

cadandcookies

01-12-2013, 00:43

Well, 4" wheels are the limit for COTS wheels in FTC, so they may very well be aimed towards that market. Plus it gives a CoF for FTC foam tiles.

geomapguy

01-12-2013, 00:50

Does it seem as though they could be used in a drivetrain?

Kernaghan

01-12-2013, 01:03

I'd look at them over Colsons any day.
Are the tread on these wheels similar to bane bot wheels or that of Colsons? In other words do these look usable for a drivebase, before I buy a pair to test them?

Akash Rastogi

01-12-2013, 01:11

Are the tread on these wheels similar to bane bot wheels or that of Colsons? In other words do these look usable for a drivebase, before I buy a pair to test them?

The tread is the same as the hi-grip Tread material.

geomapguy

01-12-2013, 01:15

The tread is the same as the hi-grip Tread material.

It says it is TPU, but it doesn't give a durometer rating.

Akash Rastogi

01-12-2013, 01:20

It says it is TPU, but it doesn't give a durometer rating.

Durometer is 77A on both. http://www.andymark.com/Rubber-Treaded-Wheels-s/220.htm

Oblarg

01-12-2013, 01:22

if these were 3" wheels, we'd try them on our Octocanum. 1/2" hex with no need for a special hub? Yeah, I'd look at them over Colsons any day.

3'' or 2'' versions of these would be greatly appreciated, yeah. Price-wise, these look like they'd blow Colsons out of the water.

geomapguy

01-12-2013, 01:23

Durometer is 77A on both. http://www.andymark.com/Rubber-Treaded-Wheels-s/220.htm

*face palm*

Didn't even notice that

Pratik Kunapuli

01-12-2013, 11:37

They do have the coefficient of friction listed for carpet as well as the FTC soft tiles so I assume they were marketing this to both FRC and FTC.

DiehardCybercard

03-12-2013, 19:06

The pictures were just updated for the Stealth wheels. There are now pictures of that display the integrated hub for both wheels.

MetalJacket

03-12-2013, 19:42

I seem to remember reading that the KoP chassis will have a direct-driven center wheel this year - does this sound familiar to anyone else? If that is correct, then these could be the wheels for the 2014 KoP

geomapguy

03-12-2013, 19:44

Yeah and it's going to be sheet metal. This must mean that the field won't have bump-like obstacles???

Madison

03-12-2013, 19:45

I'm having trouble imagining why you'd want to bolt a gear or sprocket to these wheels. What am I missing?

The only circumstance that'd make driving an attached sprocket useful is if you're driving a completely different type of wheel elsewhere. How often does that happen?

Maybe there's a dead-axle hub on its way?

Richard Wallace

03-12-2013, 19:46

My AM Stealth wheels arrived today. They are sexy. :D

geomapguy

03-12-2013, 19:47

http://www.usfirst.org/roboticsprograms/frc/blog-Kit-of-Parts-Drive-System-Option-2014

So the Toughbox Mini with 4 inch wheels?

We're getting the PDV. Anyone know when we'll get it??

geomapguy

03-12-2013, 19:50

My AM Stealth wheels arrived today. They are sexy. :D

Seem pretty durable?

Did you get hex or 8mm??

AdamHeard

03-12-2013, 19:50

geomapguy

03-12-2013, 19:56

Direct Drive center wheel that is powering dead axle outer wheels.

The only problem with that theory is that they only offer them in 1/2" hex and 8mm. Could either of these work for dead axle????

AdamHeard

03-12-2013, 19:59

The only problem with that theory is that they only offer them in 1/2" hex and 8mm. Could either of these work for dead axle????

AndyMark already sells a nice 4" wheel for dead axle.

Madison

03-12-2013, 19:59

Direct Drive center wheel that is powering dead axle outer wheels.

Sure -- but at this point, your outer wheels will be of a different sort.

Not a big deal, really, but it's not all that typical of a setup, either.

Akash Rastogi

03-12-2013, 20:00

The only problem with that theory is that they only offer them in 1/2" hex and 8mm. Could either of these work for dead axle????

...Just chain it to hi-grip wheels on the outsides.

geomapguy

03-12-2013, 20:18

...Just chain it to hi-grip wheels on the outsides.

I was referring to dead axle with just the new stealth wheels??

Andrew Lawrence

03-12-2013, 20:19

I was referring to dead axle with just the new stealth wheels??

Teams have mixed wheels before. It's not uncommon.

geomapguy

03-12-2013, 20:23

Teams have mixed wheels before. It's not uncommon.

I understand this lol. I was talking about the Kitbot

AdamHeard

03-12-2013, 20:24

My assumption is that the desire to switch the kop frame to direct drive was to make it harder for teams to not finish matches driving from chain failure. Making the outer axles live axle does nothing to benefit this.

So, to do this cleanly Andymark needs a new KOP wheel that's live axle and cheap. No sense in recreating the outer wheels (which are dead axle), so use the HiGrips.

As for the difference in tread, just trying stuff out I'd guess. Maybe the HiGrips will be sold with such tread as well.

Qbot2640

03-12-2013, 22:57

The only problem with that theory is that they only offer them in 1/2" hex and 8mm. Could either of these work for dead axle????

Could the hex version have a recess machined into the flat side to insert a bearing? If you use this in combination with the 2013 KOP belt pulleys - they already have a bearing recess.

DampRobot

03-12-2013, 23:29

Brandon_L

04-12-2013, 13:52

Anyone else having issues importing the STEP to Solidworks?

The model is still usable but it has a couple errors, and I'm a perfectionist so it bothers me endlessly. Attempting to heal them didn't work, might just go back and see if I can manually fix it later.

thefro526

04-12-2013, 14:12

Could the hex version have a recess machined into the flat side to insert a bearing? If you use this in combination with the 2013 KOP belt pulleys - they already have a bearing recess.

Out of curiosity, I checked out the model, and it doesn't look like this would be all that easy to do. The flat face's thickness is about .15" (according to the model) and the round portion that holds the hex bore over the wheels width is ~.9" diameter - so using either an R6 or R8 bearing looks to be a bit unfeasible.

With that being said, if you really wanted to use these in a dead axle setup, you should be able to get away with taking one of the wheels with an 8mm ID Bore, and opening the bore up to 1/2" ID (round) and then pressing 1/2" OD, 3/8" ID bushings in. It's worth doing the load calculations for the specific bushing you'd use, but at a glance, it seems like it'd be okay.

Richard Wallace

04-12-2013, 17:07

Seem pretty durable?

Did you get hex or 8mm??Sorry for being slow to get back here -- kinda busy in the lab today. :o

I got two wheels with hex bore. Rigged up a VexPro hex test shaft on some bearings resting in v-blocks, and an indicator to measure face runout near the outer edge of the black plastic. TIR was about 0.015 inch and I think some of that was caused by sloppy internal clearances in the bearings. These wheels appear to run pretty true.

I have not made a traction test set-up yet. Materials appear very similar to those used in other AM wheels that have been included in FRC kits for last several years, so I anticipate similar CoF. Interesting that the treads are crowned, rather than flat or dished as many other AM KoP wheels have been. This has me thinking they might be useful on the corners of a 6WD or 8WD set-up, with very little mid-wheel drop required.