The Breakroom > The Water Cooler

A Logan Lathe Story

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andyf:
Hi Bernd,

Ha! You had the same problem as I did when fitting a handwheel and dial to my 12 TPI lathe leadscrew, which moves the carriage 0.083333" per turn. Well, it would if Chinese leadscrews were that accurate, which I doubt.

I worked round it with gears:

 http://andysmachines.weebly.com/leadscrew-handwheel-and-dial.html

When I make a new topslide dial, I think I'll put new graduations on the leadscrew one. As the pics show, the divisions vary a bit in size, due to backlash in the changewheel spindle indexing.

Sorry about the  :offtopic:. This thread is about your gearbox, not my dials.

Andy 

Bernd:
Quite alright Andy. It's not that far off  :offtopic:.

Sent off the order today with the $$ to the Logan company and hopefully I'll have it sometime next week. Hopefuly this week but I don't think our snail mail isn't that fast.  :lol:

Bernd

75Plus:
Bernd, I just visited your mini mill site and found that you have made a mistake in your assumption that one turn of a 16 TPI lead screw moved the table 0.063". It actually moves the table 0.0625" per revolution and exactly one inch in 16 revolutions. It was having to deal with the half thousandth that promped me to upgrade to the 20 TPI lead screws.

Joe

Bernd:
Are you picking "nits" here Joe.  :lol:

Sorry,  :(  Couldn't resist that one.

 :nrocks:  :nrocks:  :nrocks:  :nrocks:

Bernd

Bernd:
Well I got the gear today at 3:30PM. Had it all back together after dinner and gave it a quick test.

Yup, it now cut's 18tpi when set at that lever position. One happy camper and cudo's to Logan Actuator Co.

It's abck to finishing that finger plate and on to other projects....oh, that includes the kitchen cabinets.  :coffee:

Bernd

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