If you are looking at helical for servo coupling (not encoder coupling) , stainless is the way to go, don't be tempted to buy the cheaper aluminum variety, these are OK for encoders etc.
As regards the set screw arrangement on helical, they come in basically two types, offset split, these are intended for shafts that do not have a flat area on the shaft, the other is the centre screw solid, these are intended for shafts with a flat spot.
If you visit the Helical site, they should show examples.
BTW Lovejoy is a maker of couplings (all kinds) not a type, but the name is often given to the spider type coupler.
Al.
__________________
CNC, Mechatronics Integration and Machine Design.
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E. |