What kind Endmill is this?

We spin 0.012” and the 0.020” at 60K and usually with 10-40 ipm feed depending on what we are doing. They are brittle on side loading but surprising robust at speed. We lose more due to wear and next lost is to the initial plunge.
 
Hi Guys,

I once bought a box of 25 sub 1 mm ones on fleabay, they all were reground left hand ! It took me a while to understand why they instantly snapped on touching the workpiece. They make good dowel pins though.
 
BaronJ said:
Hi Guys,

The fine carbide ones go down to 0.1 mm, they are good for burner gas jets, but you need to spin them really fast, around 25 - 35 K rpm.
Click to expand...
I bought a set of these Tungsten steel carbide (0.3 - 1.2mm) after I broke a few HSS micro bits while drilling .040" holes in my shop made misters but I had no idea they need to spin 25000 K,:frown 2: the only way I could achieve that high of RPM is if I use my woodworking router.
I don't know how many of us here have lathes or mills capable of going the high. at least I didn't pay too much for these bits.
 
Hi Ken,

Very few machines will run at those speeds. Normally you would need a high speed spindle. Most people would have to make one or buy a specialist unit.

A very cheap way would be to buy a "Dremel" and mount it in some way so you can take advantage of the speed that it can run at.
I'm sure I've seen a post where a chap made a tool post holder for one, and another who made a bracket so he could use his drill press.
The major problem with these schemes is vibration ! It takes very little to shatter a tiny carbide drill.
 
Hi Guys,

If you ever get chance to have a look around a PCB manufacturing plant, do so, the CNC drilling machines have air spindles. They can drill five boards at once. The thing that grabbed me was the lack of noise, almost silent. The vent fans were where most of the noise came from.

The plant I saw is no longer there. I used to get cheap (free) PCB material from them.
 
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