Last edited by Jon; Dec 31, 2019 at 07:15 PM.
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now the hole is thick enough for threading no need for thread inserts
Never try to tell me it can't be done
When I have to paint I use KBS products
I wonder what the rpm is? And the material?
This is from a AvE vidjeo that explains more about the tool. Very interesting.
I cannot post the link because he uses bad words and some might be offended.
But it is a worthwhile video. If you can't find it contact me off list.
Jim
I think the value of the information outweighs the risk of being offended.Originally Posted by jimfols
Those that are offended that easily should skip following the link.
Pat
Well here is a link from a manufacturer for a Formdrill. No offensive words are spoken.
high-side (Jan 2, 2020)
 - neither quick nor easy. We needed a rigid drill press and a strong worker. Result: Very little material flow.
It improved when we gave the cone 3 tiny longitudial flats - i.e. a polygon cross section. The (absurd) final solution was to drill a ø3 pilot hole and then widen it wi "Pin It")
It looked simple: 20 years ago I experimented with homemade friction drill bits as the commercial ones were way too expensive.
We ground similar shaped tungsten bits (ø5 and ø7) - neither quick nor easy. We needed a rigid drill press and a strong worker. Result: Very little material flow.
It improved when we gave the cone 3 tiny longitudial flats - i.e. a polygon cross section. The (absurd) final solution was to drill a ø3 pilot hole and then widen it with friction drilling (we needed the extra 'thickness' to cut threads). Cut! Avoid threads in sheet metal.
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