Dividing Head for PM-25 Mill

addertooth

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I would use one to cut precisions flats on round stock at precise angles, or to cut gears. Perhaps even a precision slotted tachometer wheel.
 

devils4ever

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I've been using hex and square collet blocks, but sometimes you need to divide by other than 4, 6, 8, 12. Right now I'm making a tailstock tap/die holder that is 2" in diameter. I want to flute it for grip since my knurling tool is too small. Planning on 36 flutes around the circumference.

I do plan on cutting some gears in the future although I'm not how possible that is on a PM25 mill.
 

Winegrower

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I bought the cheapest BS-0 on eBay. It’s impressively great. No sand, beautiful ground surfaces, smooth operation, etc. It was in the $240 region. Fully satisfactory.
 

devils4ever

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Now, I've got a problem. I tried to remove the 3 Phillips head screws hold on the indexing plate and one was so tight I rounded out the head.

I was extremely careful doing this knowing these were tight and the put my full body weight on it and it still rounded out.

I'm not sure what to do!

20211007_131952-edit1.jpg
 

devils4ever

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Well, I talked to Precision Matthews and they suggested drilling it out. I used a large right angle plate to mount it to my mill. Then, I used a gage pin to center the mill over the hole. I started with a large center drill. I quickly realized that I could mill off the head to remove the index plate and gain access to whatever is sticking out. I milled off the head carefully and removed the plate. Surprisingly, the remaining stud was finger tight and came out easily. SUCCESS! I'm going to replace these Phillip head screws with socket head (hex) cap screws so this doesn't happen in the future. They are 10-32 screws and not metric.

IMG_6137.jpg
 

devils4ever

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Another question for everyone. How do I remove the 3-jaw chuck? There are 3 socket head screws on the back, but there is no way to access them.

Obviously, they were put in somehow. But, I can't figure out how.

IMG_6140.jpg
 

Aaron_W

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Another question for everyone. How do I remove the 3-jaw chuck? There are 3 socket head screws on the back, but there is no way to access them.

Obviously, they were put in somehow. But, I can't figure out how.

View attachment 382563

Those screws just hold the chuck to the back plate, the chuck is threaded onto the spindle of the dividing head.
 
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