# Thread: Needs help to get .000 position 17 holes

1. ## Needs help to get .000 position 17 holes

Hey Guys need your help, I have several parts to make but BP shows .000 in position in 17 holes, can somebody tell me how can make those parts?
parts are from aluminun .100" thick

Thanks

2. Go kill the engineer! Is this in a circle or a straight line? How far apart? Cnc or
manual?

3. Aaaa yes....here is the simplest answer. .000 position allows for the possiblity of bonus i.e no bonus no positional allowance occurs if you make the holes their smallest diameter. Bonus and positional allowance occurs if you make them at to their largest diameter. i.e the diameter is .800 +- .005. At .795 you have no allowance or bonus tolerance. At .805 you have +- .005 or about true position of around .0027 ( an est. I didn't figure it out) Also... there is tol. to the location of the BH center location you can add to that.
Steve.

4. ## thanks and another tip

I'm sending part of blue print let me know if we can apply same criteria to make those parts

Thanks Again

5. we will use a cncn fadal 4020 10000 rpm 20hp

you have .000 at .266 diameter.
you have .03 at .296 diameter.

good luck
billy

Aaaa yes....here is the simplest answer. .000 position allows for the possiblity of bonus i.e no bonus no positional allowance occurs if you make the holes their smallest diameter. Bonus and positional allowance occurs if you make them at to their largest diameter. i.e the diameter is .800 +- .005. At .795 you have no allowance or bonus tolerance. At .805 you have +- .005 or about true position of around .0027 ( an est. I didn't figure it out) Also... there is tol. to the location of the BH center location you can add to that.
Steve.
Thanks billy....Yes...the same applies. I do want to make one correction though to my original example. I said "or about true position of around .0027 " . That was incorrect. It should have been around .0073 true position. I estimated the wrong way. I was in a hurry to leave and go visit some friends.
Steve

8. Thanks a lot for your help.

9. True position of ".000" What!? Has to be a Typo on the print. Here is a calculator if you need help calculating the actual True Position on your parts: True Position Calculator. Easily calculate the True Position of Holes with or without Maximum Material Condition (MMC) !