Making bushings

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randyrls

randyrls

Member
Joined
Feb 2, 2006
Messages
5,067
Location
Harrisburg, PA 17112
I have had out of round problems from time to time, so decided to try creating my own bushings. I have a 9x20 metal lathe. I am a long time woodworker / pen-maker and newbie working with metal.

MY first few attempts were not successful. I made the bushings for a mandrel, and although they looked good, the runout on the mandrel was atrocious! Finally I started to take my DTI (Dial Test Indicator) to my Jet 1014. Everything looked good until I checked the run out on the pen mandrel. UGH!!!!! It was so far out, no wonder I was having problems. I checked all my mandrels and most of them were terrible. I had cleaned the taper on the lathe, and the pen mandrel.

My MT3 ER32 collet chuck for the metal lathe has no run out and when I tried it, SUCCESS!!!! I made the bushings with a 60 degree taper to do center to center turning and the DTI was so solid, I thought the pin wasn't in contact with the tube and bushing! The MT3 collet chuck doesn't have a thru hole, and from my researches it doesn't appear to be common although I found a few in the UK.

I am looking at the collet chuck from JR Beal.

I ordered some bushings from Johnnycnc
 
hilltopper46 said:
If you don't mind sharing, how far out in real measurement was it? I want to compare to mine.

Thanks
Click to expand...

I checked the inside taper of the lathe and the registration ring. Dead on.

I checked all my mandrels. The "B" size mandrels were spot on (LT .001").

I have 5 "A" mandrels. They varied from .002" to .012" with the average being about .006". I didn't try rotating them.

I clamped one of my collets in the lathe and this was exact too with a bare mandrel clamped in the collet. The collet was like the one shown below.

http://www.littlemachineshop.com/products/product_view.php?ProductID=1747&category=874479994
 
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