Originally Posted by modnoob
Yea hole saws are pretty abrasive but the problem with a step bit is that its not made for acyillic
I agree step bit is not ideal if you are going to thread the hole but they work well in acyillic to make a hole, depending on thickness of the material of course:rolleyes: and also can use it on one side then the other so that hole is not too big when using thick material.
I never had much luck using hole saws to make a hole to thread anything. I work in as a Maintenance supervisor on a drilling rig and we do a lot of construction also, Modifying equipment putting in new holes so we can run new cable, pipe or tubing to equipment some of it we thread and some is held in place with a nut. I know we have never been able to get good thread using hole saw. it might be ok if you dont want water or air tight though??
Good luck with this seanimus, if you have a caliber you can measure the fitting and find out what it is or take it to home depot or lowes or a local hardwear store and they should be able to measure it for you to tell you what it is?? This might be your best bet instead of guessing and getting it wrong??
Also BSPP will screw into a BSPT threaded hole. just have to use a gasket or o-ring to get watertight seal. a BSPT will also screw into a BSPP but again you will need gasket or o-ring. the real differance is the BSPT threads are made to seal on themself and the BSPP threads are made to hold it together but to use a o-ring or gasket to seal... hope this helps some???
at work on a drilling rig off indonesia now... so my day is just starting Edited by seross69 - 1/5/13 at 7:10pm