Plating / NPT threads

[mcars]

Need to produce an 3/8-18 NPT external threaded item that will be Zinc Plated .0003 / .0004 " How do I hold my threads ? Do I cut them to accept 2 or 3 turns deep on a standard L1 gage. These will be cut on a Doosan Puma 240MS.
Thanks all.

[PBMW]

What I would do is make them to fit the gage, then comp it in 4x the plating thickness. That way after plate, they fit the gage just dandy.

[DonutSlayer]

Safe way would be to make some test parts and see how the plate affects them , also depends on how picky your customer is, you usually have +/- 1 turn tol., so at .0003/.0004 plate thickness I doubt it will affect the L1 gage by more than 1/2 turn, but you can determine that on the machine by adjusting the wear offset, cut the part where the gage goes flush then enter another -.0008 X offset and see where the gage goes and make all the parts to that size.

[Geof]

And cross your fingers that your plater holds the thickness to what you need.

I have had a few bad experiences with platers putting on .0005" one time and then one h*ll of a lot more the next time.

[shgshg]

Hi,

you can use the attached table: