Math Problem

[cfellows]

The leadscrew on my minilathe is 16 threads per inch. To advance the carriage .001" using the leadscrew requires turning it 1 / 62.5 of turn. So, if I use my electronic dividing head to divide a circle into 62.5 equally spaced divisions, what is that going to look like. I'm having a really hard time visualizing the graduation numbering on such a dial...

Chuck

 

[mklotz]

Put 125 divisions on the handwheel. Then each division is 0.0005" advance.

Would that work?

 

[Antman]

125 divisions is easy using gears to divide

 

[cfellows]

Yes, I could do 125. I could also set it up to do 125 divisions then mark every other position. I guess realistically, that's the only way to get 62.5 divisions in a circle.

Chuck

 

[Jasonb]

My old Emco used to have a wheel divided into 62.5, personally I would stick with that as 99% of the thime you are likely to be feeding in a fractional amount anyway eg 0.03125, 0.0625, 0.125 and having it in 125 divisions could complicate things.

Maybe add a mark at 64th and 32nd equivalents then its easy to just count the number of fractions.

 

[Noitoen]

You could install a 2:1 belt drive with a double shaft stepper and get the 1/125 divisions to represent 0,001" and controlled feed at the same time :big: :big: :big:

 

[cfellows]

You could install a 2:1 belt drive with a double shaft stepper and get the 1/125 divisions to represent 0,001" and controlled feed at the same time :big: :big: :big:

Don't laugh! I've been thinking about that. All this stepper motor knowledge I've gained over the past week has set loose a monster! I'm looking for all possible opportunities to stepper-motorize anything and everything. Actually wondering where I could buy discounted Arduinos and stepper drivers in bulk! :big:

Chuck

 

[Noitoen]

Arduinos, I don't know I like PIC microcontrollers programmed in assembly myself. Steppers I can get more than I can use. I work in a REEE recycling plant and get all kinds of motors from those big office machines. Recently I've recovered about 15 steppers with encoders built in. Can double check for missing steps I suppose shipping to the US wouldn't be worth it.

 

[JorgensenSteam]

I can remember the old days when you had to turn the knobs on your machines by hand......

Sorry, couldn't resist......pun intended.

 

[purpleknif]

I ran an old Defiance boring mill for a while that had .170" of travel per revolution on the saddle. What a pain. Easier to use jo blocks and an indicator.