I am making a Boring Head for my Mill using the Steve Campbell boring head plans. The 6-40 leadscrew moves the head .025” per revolution so I need to put 25 divisions on the dial. I am trying to figure out the best way to go about this. My problem is that my 90:1 6” rotary table did not come with an indexing plate with 50 holes. What is my best option to divide this by 25 divisions? Do I need to make a dividing plate with 50 holes? I do have the capability to make this as my DRO has the ability to do bolt patterns but thats a lot of work for a one off part!
All the info on the web (dividing head division charts and pdf charts) say that I need a dividing plate with 50 holes and that I would need to turn 3 full turns and 30 additional holes. Is this wrong? Is there some way to get around this or is there a hole circle pattern that is close enough? OR am I being a dope and making this more complicated than it is?
I have the following 3 dividing plates:
Plate A: 15, 16, 17, 18, 19, 20
Plate B: 21, 23, 27, 29, 31, 33
Plate C: 37, 39, 41, 43, 47, 49
Can anyone tell me what I need to do or what my options are ?
I also have a 5C Spin Indexer that has 33 holes and I also have a very smal indexer that uses 3C collets but I only have 3 dividing plates with a 16, 48 and a 33 hole pattern. Lastly I have a another rotary table thats 8” in dameter that has a 40:1 ratio but has no dividing plates and cannot accept any. Are any of these better to use than my 6” 90:1 rotary table?
All the info on the web (dividing head division charts and pdf charts) say that I need a dividing plate with 50 holes and that I would need to turn 3 full turns and 30 additional holes. Is this wrong? Is there some way to get around this or is there a hole circle pattern that is close enough? OR am I being a dope and making this more complicated than it is?
I have the following 3 dividing plates:
Plate A: 15, 16, 17, 18, 19, 20
Plate B: 21, 23, 27, 29, 31, 33
Plate C: 37, 39, 41, 43, 47, 49
Can anyone tell me what I need to do or what my options are ?
I also have a 5C Spin Indexer that has 33 holes and I also have a very smal indexer that uses 3C collets but I only have 3 dividing plates with a 16, 48 and a 33 hole pattern. Lastly I have a another rotary table thats 8” in dameter that has a 40:1 ratio but has no dividing plates and cannot accept any. Are any of these better to use than my 6” 90:1 rotary table?