Remove burrs from knob inner shaft

[benny_profane]

I've got some knobs that have burrs around the set screw holes. What is the best way to remove these short of muscling the knob onto the pot shaft?

[EBK]

Hobby (Xacto) knife?

[benny_profane]

Haha oh man, yeah I'll have to give that a shot. Another issue: the specs on these state inner diameter of 6.4mm (so fit for 1/4" pot shafts), however, it is rather tight. I don't think these are 6mm because they wouldn't even begin to fit, right? I suspect I might have to slightly ream these out? If that's the case, I'm not sure how best to proceed.

[EBK]

Use a 1/4" drill bit to ream them out by hand.  But, wrap some tape around the shaft of the bit so you don't slice up your fingers.

[benny_profane]

Use a 1/4" drill bit to ream them out by hand.  But, wrap some tape around the shaft of the bit so you don't slice up your fingers.

Good call! Hopefully this'll work it out! I've got a handful of knobs with this fit problem so this could be the trick to get them all in workable order.

[pickdropper]

Use a 1/4" drill bit to ream them out by hand.  But, wrap some tape around the shaft of the bit so you don't slice up your fingers.

This.  Better yet, get a 1/4" end mill bit.  It's flat on top and works a bit better.

[benny_profane]

The drill bit worked perfectly. I just attached it to a vice, inserted the knob, turned a few times, screwed the set screw in and out, repeated the process, and cleaned it out. There was quite a lot of excess material in there.

I'll keep the mill bit in mind. I don't have one on hand, but that does look like the perfect tool for the job.

Thanks all!

[alanp]

Where are the knobs from?

[benny_profane]

Where are the knobs from?

An eBay seller of some winged Marconi knobs.