Material from MMC, billed as "Easy-to-Machine Glass-Mica Ceramic"
I've been asked to bore a 1/4" diameter thru hole in a 3/8"diameter rod. It only needs to be about 1/2" long.
I did read up in the forums and ran a lot of pecks, low feed force, and cleaned out the swarf frequently.
I did manage to drill the hole fine, but the part cracked lengthwise.
I tried different speeds, step-drilling, drilling vs. boring, etc. with pretty much the same result. I've been using a normal steel collet but wondering if I'm over-clamping or if I should just use a brass or plastic collet.
I did clamp it pretty hard at first, so wondering if I fractured the whole length of rod at first and my subsequent issues were from that.
I've been using carbide tooling, it's what I have and it's hard to justify diamond for one part since I don't even know if it's a tooling issue or clamping issue.
Also, I'd welcome recommendations about drilling and then parting off or cutting to length first then drilling.
thanks folks, this one has me frustrated.
I've been asked to bore a 1/4" diameter thru hole in a 3/8"diameter rod. It only needs to be about 1/2" long.
I did read up in the forums and ran a lot of pecks, low feed force, and cleaned out the swarf frequently.
I did manage to drill the hole fine, but the part cracked lengthwise.
I tried different speeds, step-drilling, drilling vs. boring, etc. with pretty much the same result. I've been using a normal steel collet but wondering if I'm over-clamping or if I should just use a brass or plastic collet.
I did clamp it pretty hard at first, so wondering if I fractured the whole length of rod at first and my subsequent issues were from that.
I've been using carbide tooling, it's what I have and it's hard to justify diamond for one part since I don't even know if it's a tooling issue or clamping issue.
Also, I'd welcome recommendations about drilling and then parting off or cutting to length first then drilling.
thanks folks, this one has me frustrated.