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+--- Thread: Power lead screw for 7x12. (/thread-1884.html)
Power lead screw for 7x12. - Brian - 12-07-2013
Had to visit my local garage today and was given a 12 volt wiper motor with its mounting bracket.
Just the thing to motorize the lead screw on the 7x12, after striping off all the useless bits I started cutting down the bracket to make a mounting.
the standard spindle is a little short so I have cut the mounting bosses back 5mm to make the spindle more assessable.
[attachment=7381]
Before going any further I need a gear that will mesh with the change gears, so I am making a cutter (N01 module) so I can make the gear.
[attachment=7382]
Slowly slowly Brian.
RE: Power lead screw for 7x12. - chucketn - 12-07-2013
(12-07-2013, 03:12 PM)Brian Wrote: Before going any further I need a gear that will mesh with the change gears, so I am making a cutter (N01 module) so I can make the gear.
Slowly slowly Brian.
Brian, is that cutter for a fly cutter?
Chuck
RE: Power lead screw for 7x12. - Brian - 12-07-2013
(12-07-2013, 03:37 PM)chucketn Wrote:(12-07-2013, 03:12 PM)Brian Wrote: Before going any further I need a gear that will mesh with the change gears, so I am making a cutter (N01 module) so I can make the gear.
Slowly slowly Brian.
Brian, is that cutter for a fly cutter?
Chuck
Hi Chuck
Yes it's a adaption of the one I am using to cut the gears for the new clock. tomorrow we will see if it works? I am also making one to cut the pinions for the clock.
Brian.
RE: Power lead screw for 7x12. - Brian - 12-08-2013
The new gear is made from shatterproof plastic from a old boat hatch.
It runs perfectly with the original gears, so that's another part done. it just needs a adapter to fit the spindle.
[attachment=7383]
Brian.
RE: Power lead screw for 7x12. - Brian - 12-10-2013
Well that's the motor fixed in place next job is to measure the amperage when driving the lead screw, then I can order the control unit.
So far so good, the gears can be changed with out disturbing the motor,
and the drive can be disconnected by shifting the front leaver.
[attachment=7390]
Brian.
RE: Power lead screw for 7x12. - chucketn - 12-10-2013
Looking good, Brian!
Chuck
RE: Power lead screw for 7x12. - Shawn - 12-10-2013
I love the placement of the motor, I did a similar modification to my SB 9" and use it all the time. I could use the gears on the lathe itself but this is so much quieter and I'm not stuck with whatever gearing I had installed last time I cut a thread. I don't have a QCGB so setting the feed rate is a bit more involved than a couple levers. Having a variable feed rate would be even nicer. I used step pulleys but found I was using only one step 95% of the time so it has never left that postion in the past year. The feed rate leaves a nice finish and I'm never in a rush so I'm not really concerned about anything else.
I'm using what I had on hand so it's a 1/2 HP motor driving a 25:1 speed reduction drive to a pulley on the leadscrew. I bought a another leadscrew bearing for my lathe on Ebay because I couldn't bring myself to cut into the existing one. If I ever decide to remove the drive (doubtful) I can simply install the original bearing back on.
Shawn
RE: Power lead screw for 7x12. - stevec - 12-10-2013
Nice solution Shawn, good job!
Any thoughts of changing to some kind of variable speed motor?
RE: Power lead screw for 7x12. - Shawn - 12-11-2013
A variable speed motor would definitely be the way to go, I think Brian has got it right for sure. I was testing it out when I put this together. The only reason the motor is painted is because I switched it off the lathe for a 3/4hp that ran much smoother. It has worked so well I haven't bothered to change anything.
Shawn
RE: Power lead screw for 7x12. - Brian - 12-12-2013
That looks a mighty powerful system Shawn. I cant stop this wiper motor by hanging on to the saddle hand wheel. so yours must be great.
I wonder if it is possible to broach keyways or splines by indexing the chuck ???.
After getting the meter from the boat, I tested the draw it's 5A similar to
the motor's used on the mill table. so I will order a PWM control unit ans tap into the mill power supply.
I cant use the other end of the lead screw because I have a wheel to fine feed the saddle if I require it. one div = .001".
[attachment=7403]
Brian.