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Harold Hall's precision grinding table
wongster:
--- Quote from: xo18thfa on June 04, 2011, 05:37:58 PM ---
Wongster: I just drill a very small pilot hole first, countersink then follow up with the full hole. If you drilled to main hole first, you'll be fine. Just run slow speed with oil. You'll be OK.
Those "0 flute" countersinks like someone showed are nice. I need to get some.
Bob
--- End quote ---
Thanks Bob. I'll try with the pilot hole as suggested. From the few c/sink holes I did with full hole, the chatter and noise came on the deeper I apply th c/sink enough at very low speed.
Regards,
Wong
wongster:
--- Quote from: Bluechip on June 04, 2011, 05:55:26 AM ---Hi Wong
See if you can get c/sinks similar to these:
http://www.axminster.co.uk/axminster-axminster-chatter-free-countersink-prod21819/
As others have said, fine feed, low speed & oil. Although I use Rocol RTD fluid on steel.
Despite what they say, it is possible to make them chatter a bit on stainless, but you have to really abuse them to do it.
Under normal use, they don't chatter at all.
The swarf comes out as a very thin ribbon, which can be very sharp if stainless .. :( verified by experiment ... :palm:
Dave BC
--- End quote ---
Hello Dave,
Thanks for pointing me to Axminster. They're great folks to deal with despite my small orders. The shank size of the 3 piece set has the largest at 10mm; perfect for my Sherline ER16 spindle!
Regards,
Wong
Bluechip:
Hi Wong
I'm surprised you could not get them locally ... I bet they're made in the Far East.
Mine are still going strong, and they've been used a fair bit. But, as Bogs pointed out, it appears they can be sharpened.
Dave BC
wongster:
Hi Dave,
I asked around those shops I frequent due to their proximity. They only carry the type I bought sometime back. Didn't have a chance to pop by the shop Chan Man Lee that I was pointed to by a kind gentleman of this forum. Buying on the net and getting it delivered seem the easiest option at this point; been to busy with my work.
Anyway, I'm having my 1st weekend off after 2 months. Hope to have some good quality shop time.
Regards,
Wong
Chuck in E. TN:
I am getting ready to build this rest, using imperial measurements. I have found a few charts on the web listing metric to imperial fasteners, but nothing comparing metric to imperial stock sizes. Anyone got a reference for metal stock sizes for metric to imperial?
Chuck in E. TN
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