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Unread 09-23-2018, 11:40 AM
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Collar clamps slip loose, alternative options?

We have typically used the vex pro collar clamps, but they tend to have a habit of coming lose and letting the part wander. What should we be using, particularly for parts like drive wheels which have a lateral load on them at times? Retaining ring / e ring style? Would we have to cut a groove in the axle for that?
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Unread 09-23-2018, 11:45 AM
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Re: Collar clamps slip loose, alternative options?

My favorite way for retaining something like a drive shaft is to just tap the ends for a 1/4-20 bolt, and then pop a 1/4-20 and washer onto the end of either side of the shaft. Add some loctite for added durability and it works great.
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Unread 09-23-2018, 11:46 AM
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Re: Collar clamps slip loose, alternative options?

Use a quality shaft collar and it will be fine. The Rudland ones available from AndyMark are quality units designed and manufactured by a company that specializes in shaft collars and they work exactly as intended when properly tightened. The Vex collars are good spacers however.
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Unread 09-23-2018, 11:47 AM
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Re: Collar clamps slip loose, alternative options?

We ran into many of the same issues with the clamp style collars. grooving the shaft and popping an e clip in there proved to hold all season without any replacements. definitely recommend this instead of the shaft collars.
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Unread 09-23-2018, 12:16 PM
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Re: Collar clamps slip loose, alternative options?

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Originally Posted by Mr V View Post
Use a quality shaft collar and it will be fine. The Rudland ones available from AndyMark are quality units designed and manufactured by a company that specializes in shaft collars and they work exactly as intended when properly tightened. The Vex collars are good spacers however.
That's really good to know. Do you use the ones with the two screws (on on each side)? They look more expensive but yeah, probably better quality.
Thanks for the recommendation.

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Originally Posted by wheelerka View Post
We ran into many of the same issues with the clamp style collars. grooving the shaft and popping an e clip in there proved to hold all season without any replacements. definitely recommend this instead of the shaft collars.
Do you have any recommendations on what clips you use? Thanks!
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Unread 09-23-2018, 12:25 PM
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Re: Collar clamps slip loose, alternative options?

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Originally Posted by wheelerka View Post
We ran into many of the same issues with the clamp style collars. grooving the shaft and popping an e clip in there proved to hold all season without any replacements. definitely recommend this instead of the shaft collars.
do you need a lathe to groove the shaft for an e-clip?
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Unread 09-23-2018, 12:26 PM
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Re: Collar clamps slip loose, alternative options?

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Do you have any recommendations on what clips you use? Thanks!
For a half inch hex shaft, we typically use the 1/2” clips from harbor freight. they have a nice assorted set if you’re not sure about sizing.
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Unread 09-23-2018, 12:28 PM
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Re: Collar clamps slip loose, alternative options?

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Originally Posted by deslusionary View Post
do you need a lathe to groove the shaft for an e-clip?

It really helps. I have had some success carefully making a groove with a hacksaw before we got our lathe.
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Unread 09-23-2018, 12:28 PM
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Re: Collar clamps slip loose, alternative options?

We use the single bolt versions that have been available in through FIRST Choice in recent years, which have been available in different colors. AndyMark keeps the clear anodized units in stock though. http://www.andymark.com/product-p/am-1238.htm
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Unread 09-23-2018, 12:29 PM
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Re: Collar clamps slip loose, alternative options?

Quote:
Originally Posted by deslusionary View Post
do you need a lathe to groove the shaft for an e-clip?
That’s typically how we do it, yes.
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Unread 09-23-2018, 01:31 PM
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Re: Collar clamps slip loose, alternative options?

I've done a few techniques:

Bolt and washer on a Churro shaft in low-load applications.

The AndyMark collar clamps are nice, too. The am-1238 linked above is totally fine, though I like how the am-2871 lets you add and remove it in the middle of the shaft without disassembly.

I've also used E-clips from McMaster when lathe access was easy. They worked fine, and in 2016 I recall we used them on drive.
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Unread 09-23-2018, 01:58 PM
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Re: Collar clamps slip loose, alternative options?

We use Thunderhex almost exclusively now. We use our low-quality 7x10 lathe to just tap the ends to 1/4"-20, and stick a nylon-path-locking buttonhead 1/4"-20 on the end with a washer. Very easy, very quick, and effective. You can also tap by hand or with a power drill as long as you torque-limit and are very careful.
They can come loose, but it's rare. Next year we'll have a better lathe to make grooves for circlips with, and may use both methods at once on shaft ends for added security.
We did have to use a couple shaft collars on the robot, but we buy only the 2-piece "heavy duty" shaft collars from Vex when we need to. They don't suffer from slippage nearly as much as the thin single-screw types.
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Unread 09-23-2018, 02:05 PM
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Re: Collar clamps slip loose, alternative options?

Loctite the screws and put a little retaining compound between the face of the shaft collar and the hex shaft. Help them take lateral loads.
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Unread 09-23-2018, 02:07 PM
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Re: Collar clamps slip loose, alternative options?

Quote:
Originally Posted by cad321 View Post
My favorite way for retaining something like a drive shaft is to just tap the ends for a 1/4-20 bolt, and then pop a 1/4-20 and washer onto the end of either side of the shaft. Add some loctite for added durability and it works great.
+1 for this method over collar clamps when possible

We had 1/4-20 bolts and washers on the lower shafts for our elevator/climber last year and they worked flawlessly, but the collar clamps on our upper shaft failed a few times.
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Unread 09-23-2018, 02:30 PM
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Re: Collar clamps slip loose, alternative options?

We pretty much exclusively use grooves cut into the shaft and snap rings. It has yet to fail us in any way. We do however use shaft collars on something that we want to be adjusted a lot. In that case we try to use 2-piece shaft collars as they don't require removal of the shaft to get it off.
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