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Re: An Extra Leadscrew

 

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Hi Mike
As you have seen on the other pictures (hopefully), there is a big wheel on the left side of the lathe, fastened to the spindle.
My wheel has a circumflex of 1502 mm, however the distance between the millimeter marks is also a mark, so I have 3004 "marks" . My eyes are not as they were, so I have put on a magnetifying glass.
So, if you are standing on the same foot, in the same position and use the same eye, you can get a good reading.
With the Excel program, it is easy to do the calculation. My reading of hundred is 0 or 5.
Ex.? 91,35?
On the picture you can see a thin red needle. If you put the 2 needles in line, it will be easier to do a good reading .
The relation between reading wheel and clock wheel is around 10:1.
However, it happens I have to make a new clock wheel.


/Johannes
Mexico


From: [email protected] <[email protected]> on behalf of mike allen <animal@...>
Sent: Sunday, May 11, 2025 12:46
To: [email protected] <[email protected]>
Subject: Re: [7x12MiniLathe] An Extra Leadscrew
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??? ??? Thats pretty slick., how are ya keeping track on the indexing when ya gut? gears ? Is there something on the other side of the spindle that locks in position ?

thanks

On 5/11/25 8:44 AM, Johannes wrote:
Hi
The nut is fastened on a little plate on the back side of the saddle.
The motor is a very cheap , higher speed water pump motor. Silent and strong enough for the job.

As you can see, I have replaced the original press board with a brass plate, it is longer and has an extra contact pressure on the outside of the bed-way. This is done on the back side also. This gave me a much better anti-twist of the saddle.

This new lead screw is easy to set up with 2 screws for special jobs. To cut a clock wheel with 144 teeth takes time.?
One tooth wrong, you have to start again.
Good advice: Start with the biggest "wheel" first.

Johannes
Mexico


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