OK, went into the shop after getting home from dentist. The chart in the top of the belt drive lid says it is running at 2420RPM at the highest speed.

 

OK, went into the shop after getting home from dentist. The chart in the top of the belt drive lid says it is running at 2420RPM at the highest speed.

That sounds awfully low ... I'm not sure if the hole finish would be acceptable at those rpm ... but I'll give it a try anyway. 1/32" HSS bits are quite cheap compared to carbide. And yes, I'll buy Cleveland bits and nothing else.

Glad to hear you've still got some teeth left ...

 

Glad to hear you've still got some teeth left ...

Only until next Thursday. Getting the last 7 out. Something going on with my jaw bones, teeth just come loose and only gums holding them. These will need some oral surgery because I've put it off too long.

 

Only until next Thursday. Getting the last 7 out. Something going on with my jaw bones, teeth just come loose and only gums holding them. These will need some oral surgery because I've put it off too long.

... ouch! ... I didn't know it was that bad, sorry about the bad joke

Anyway, I have a couple of friends that have gone through the same thing and they tell me that their lives have improved dramatically after that. The quality of dentures nowadays is way better than it used to be.

 

The quality of dentures nowadays is way better than it used to be.

Have had full upper since 2014 and a partial lower since the same time. The worse thing is I only had a few fillings. No idea from doctor or dentist what is happening.

I'm not sure if the hole finish would be acceptable at those rpm

I don't understand that statement? Why is finish important? Though it is good for a drilled hole, it is just getting a lead through it and solder. I use a piece of MDF as a backup so no burr on the bottom either.

 

Why is finish important?

I'm just afraid the hole's copper layer might curl up a bit on the edges. And in my PCBs some of the holes have a very narrow copper ring around them.

But as I said, I've got nothing to lose by making a few tests.

 

Thought you meant finish inside the hole. My stuff has been high amperage and lots of copper around the holes, but haven't seen any pull up of the copper.