stepper couplers

[corrie]

A few ?,s I find my couplers comming loose too often any reasons behind this? I use lovejoy as of now. Any recomendations on some better couplers and where to get some.

[jeffs555]

What do you mean by "comming loose"? If you mean the set screws are vibrating loose, then loctite should fix the problem.

[vladdy]

usually they don't give much trouble, especially if the set screw locks down onto a flat on the shafts...I _assume_ we're talking about the style that uses set screws through the coupler onto the shaft flats..
a wee little dab of silicone onto the setscrew will help a bit..
never had any problems with the 'clamping' style that have a machined slot and use screws to 'squeeze' onto the shaft...
more money though...

..enjoy..

[corrie]

Thanks for the response, ya lock tite sounds good but personaly would like to change from lovejoy. Where in Canada could i get the split type?

[vladdy]

I currently use the cheapies from princess auto...5/8 spider style complete set for 3.49.....need a reasonably rigid motor mount,

with the split style or machined multiple slot 'bellows' type the is some additional alignment support comared to the lovejoy or spider types..

..enjoy..

[corrie]

Another thing I was thinking of was to buy some cheap couplers and bore out the set screw and tap for a larger set screw.What about counter sinking the motor shaft a little just to recieve the set screw,would it be worth it even,just a thought?Also thanks for the responce,cheers.

[vladdy]

didn't even think of the type of shafts you must have...
I assumed your shafts had a flat machined onto them...it's been a while since I've looked at mine, and all have a flat on them...setscrew does'nt come loose with that style...

oops...

even if you use a dremel or die grinder to put a bit of a flat where the setscrew bites, it will help quite a bit..

..enjoy..