Connect to Shaft of RS 775 Motor

[droswell]

I might be confused, but it sounds like you're attaching the motor directly to a lead screw?

If this is the case, I would reconsider. Running most lead screws at > 1000 rpm is probably not a good idea. Even fine threaded screws will move extremely rapidly at this speed, if they have enough torque to even turn the screw. This is the perfect case for using a gearbox, such as a VersaPlanetary from VEX or a P60 from Banebots.

[Jared]

Check out this document for some lead screw calculations/guidelines:
http://www.thomsonbsa.com/pdf/bsa_en...og_section.pdf

[Mr V]

For Ultimate Ascent we attached a lead screw to a Versaplanetary with the 1/2" socket from this set (since we had 1/2" output shaft VPs) http://www.harborfreight.com/7-pc-38...set-67929.html because we needed the swivel aspect.

We used a nominal 3/8" lead screw drilled and tapped it to put a bolt through the pin retainer hole and then drilled through the socket and VP output shaft for a cotter pin to retain the socket to the output shaft. We did choose to turn the end of the VP output shaft so that it would extend into the round hole in the socket because we did not feel the shallow depth of that socket didn't have sufficient room for the cotter pin.

If you do not need a swivel head to NAPA and get a single 1/2" impact socket in either 3/8" or 1/2" drive depending on the lead screw you are using.

As others have mentioned you can use a VP as a 1 to 1 but I think you'll find that a little fast. But you can always try it and if it is deemed too fast put a reduction stage in.

[amesmich]

Thanks for all the feedback. It does not fall on deaf ears. The speed is a good point. We are considering a gearbox but needed to plan for any possibility.

Thanks

[FrankJ]

I use the green bearing retainer Loctite with a tite slip fit. Getting the press fit just right & bending the motor shaft is right next to each other.

When you say voltage drop do you mean your adjusting the 18 volt curves for the 12 V available?

[amesmich]

Originally Posted by FrankJ

I use the green bearing retainer Loctite with a tite slip fit. Getting the press fit just right & bending the motor shaft is right next to each other.

When you say voltage drop do you mean your adjusting the 18 volt curves for the 12 V available?

We readjusted for the 12v and then accounted for a non-ideal power source. So voltage drop of battery under load or after some time. Not a big factor for us but not forgotten either.