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PM1340GT cross feed dial increments

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Lonnie

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#1
I've had my lathe for a couple years now and have always had a DRO on it and never paid much attention to the dial increments. Today my DRO was acting up and I had to revert to using the dial markings. Well, the cross feed dial increments don't make any sense to me. I've uploaded a picture of the dial so you can (hopefully) see what I mean.
If I take the backlash out and move the dial in 1 small line, it moves less than 0.001". I put a dial indicator on and tried to make sense of how much it moves but for the life of me can't see any sort of correlation with the amount the dial is turned.
If I turn the dial to the 5th small line the dial indicator moves +/- 0.003". If I turn it into the 1, it moves 0.006" and to the 2 it moves 0.012". On the number 3 it moves 0.019" Basically, every 10 small notches moves the slide in 0.006" - 0.007". If I make 1 complete rotation of the dial, 0 back to 0, it moves the dial indicator 0.100". There are 156 small lines (157 to get back to 0) on the dial in total. If you do the math, every small line moves the slide 0.0006369".
I contacted PM and they are telling me this should be the correct dial for my lathe. I think this dial is not correct for my lathe but I've been wrong before.
Does any one else have or had any issues with their cross slide dials? I thought I had read on here someplace that someone did have the wrong dial on theirs but can't seem to find the thread/post. If you did have an issue, what dial did you replace it with so I can do the same. My DRO is working properly again but if I ever had to revert to using the dial indicator again, I'd like to have it working properly.
Thanks
 

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davidpbest

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#2
I had the exact same issue with my 1340. The factory installed the wrong dials. Matt has them send me replacement, and I received an entire new lead screw assembly. PM me if you want more into.
 

7milesup

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Very interesting. I can't provide any help but I am now wondering about my 1022 lathe.
 

Lonnie

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#4
Thanks David. I knew I had read where someone else had an issue but couldn't quite remember. And, if I remember correctly, I got my lathe at roughly the same time you got yours so it would make sense that we both had the wrong dials.

I just finished with a few emails with PM and they have determined that I do indeed have the wrong dial on my lathe. They are shipping me the correct dial for the lathe. Can't say enough good about the customer support from Precision Mathews! This is the reason all my machining equipment has come from them. :)
 

7milesup

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Can't say enough good about the customer support from Precision Mathews! This is the reason all my machining equipment has come from them. :)
^^Got that right!!^^
 

Rich V

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Thanks David. I knew I had read where someone else had an issue but couldn't quite remember. And, if I remember correctly, I got my lathe at roughly the same time you got yours so it would make sense that we both had the wrong dials.

I just finished with a few emails with PM and they have determined that I do indeed have the wrong dial on my lathe. They are shipping me the correct dial for the lathe. Can't say enough good about the customer support from Precision Mathews! This is the reason all my machining equipment has come from them. :)
Did you confirm that your lead screw is not metric? I'm guessing that the "wrong" dial is for metric lead screws.
 

DiscoDan

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#7
Odd
 

Lonnie

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Did you confirm that your lead screw is not metric? I'm guessing that the "wrong" dial is for metric lead screws.
When I let them know that 1 complete revolution of the dial was moving the slide 0.100", they said it's the right lead screw with the wrong dial.

I know you have a dial coming but from the picture the increment is 0.002" but it looks like the two lines showing how much that 0.002" represents is not as much as the actual increments and if you extrapolate a bit it probably is 0.003". Or maybe I have been drinking too much coffee this morning.
I thought about that too but it still doesn't make any sense for the markings on the dial.
For me, it would make sense that turning the dial in 1 small increment would mean taking .002" off the total diameter of the part.
 
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