Securing gears on shafts

[Tim Baird]

Originally Posted by tdlrali

It's probably a good idea to locktite the setscrew, just to be sure

If you are going to Loctite it (which I recommend) try to use the blue variety. It'll hold, but you can get it off later in the heat of battle without working too hard. The red will just cause unnecessary frustration.

Speaking of being "in the heat of battle", I'm a huge fan of pinning gears, hubs, etc to shafts. If you're trying to install one and someone says "you have 30 seconds to be on the field", a drill bit and a quick 'snap' can work wonders, if anything to get you through one more match.

[IKE]

"LOCTITE THREADLOCKER 222 LOW STRENGTH PURPLE, 6 ML. TUBE (38653)

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Low strength threadlocker. Designed for precision metal fasteners under 19mm. Protects threads from rust and corrosion. Removable with hand tools.

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Nobody ever seems to use Purple. Not sure why. Grant Imahara recommends it in his Battlebots book Kicking Bot.

[vivek16]

Originally Posted by Tim Baird

If you are going to Loctite it (which I recommend) try to use the blue variety. It'll hold, but you can get it off later in the heat of battle without working too hard. The red will just cause unnecessary frustration.

Speaking of being "in the heat of battle", I'm a huge fan of pinning gears, hubs, etc to shafts. If you're trying to install one and someone says "you have 30 seconds to be on the field", a drill bit and a quick 'snap' can work wonders, if anything to get you through one more match.

Speaking of that, get a bunch of 3/32" bits. they're only 52 cents here: http://www.buydrillbits.com/products...?c=JL-USA-FRAC

Just invest in 40 of them. they're only twice the price of spring pins.

I am slightly kidding but it does seem like a good idea in a hurry
It would probably be better to use a spring pin.

-Vivek

[Dick Linn]

You can get a 10-pack of 3/32" bits at Harbor Freight for $1.49, not that there very good ones. http://www.harborfreight.com/cpi/cta...emnumber=93077

One think I find useful around the shop is to have some drill rod in various sizes. In smaller sizes, it is very inexpensive. You can get a 3 ft. length of 3/32" drill rod for about a buck. Larger sizes can be used for axles, etc.

http://www.use-enco.com/CGI/INPDFF?PMPAGE=789&PMCTLG=00

[Stephen Kowski]

I'm sure someone has probably mentioned this and I missed, but that's ok I'll jump on this dog pile nonetheless....

A very reliable method that has worked in the past for me is using pins in the hubs....buy a standard sized steel pin (one size should work for many, many applications so this is a one time investment you can use again and again)

this can be done pretty easily with a vice and a standard table top drill press

So for example if I had a quarter inch pin I would buy a bit two steps down on your handy ansi size charts (in this case a C drill bit will work; .2420) drill the .2420 hole through the hub (perpendicular to the shaft, not through the face of the gear) and then drill through the shaft where you want the hub to sit

repeat the same process with these new drilled holes, but this time use a reamer that is only one step down from 1/4" (in this case a D reamer; .2460)

now slide your gear on your shaft start the pin in the hole on the hub and use a press (or if you dont have access to a press, a hammer will work, notice I said it would work but may not be ideal) to force the pin down through the hub and shaft, stop once you are all the way through the hub

this is a very good connection; if it something you will be changing often I wouldn't try it, but if you just want something that you want to be permanent and you don't want to even think about it breakin/coming loose

Oh and if something somehow shears (has yet to happen to me)....knock/drill back out the pin and just go to a larger pin size using the same method.....

gl

[Dick Linn]

Unfortunately, no hub in this case...