Theoretically, HSS drills should all perform the same - I've even found Silverline drills to be ok, which must be a first.
John
I've even found Silverline drills to be ok, which must be a first.
John
I've even found Silverline drills to be ok, which must be a first.
John
I'm going to hazard a guess that your occupation involves the drilling of cheese...
So cheap though....a few years ago they would be a couple of quid each!
Theoretically, HSS drills should all perform the same - I've even found Silverline drills to be ok, which must be a first.
John
So cheap though....a few years ago they would be a couple of quid each!
Theoretically, HSS drills should all perform the same - I've even found Silverline drills to be ok, which must be a first.
John
Says who???? don't get that statement at all. HSS is just the type of alloy used, not an indication of straigtness (cheap drills are often bent), tollerance on size (is that 3.5mm drill really cutting a 3.5mm hole), tollerance of angles and releif of the tip etc. All this affects the cutting speed.
I've always used Dormer as my Dad was an engineer and that's what he used and passed on to me. And i buy packs on ebay when I need mroe. Expensive, but if you learn to sharpen them well shoudl last you a long long time...
Having said that if you're just drilling pilot holes in wood it doesn't really matter what you use and if you're drilling steel with a cheaper drill bit, use plenty of cutting fluid and it should be fine.
So cheap though....a few years ago they would be a couple of quid each!
Theoretically, HSS drills should all perform the same - I've even found Silverline drills to be ok, which must be a first.
John
Says who???? don't get that statement at all. HSS is just the type of alloy used, not an indication of straigtness (cheap drills are often bent), tollerance on size (is that 3.5mm drill really cutting a 3.5mm hole), tollerance of angles and releif of the tip etc. All this affects the cutting speed.
I've always used Dormer as my Dad was an engineer and that's what he used and passed on to me. And i buy packs on ebay when I need mroe. Expensive, but if you learn to sharpen them well shoudl last you a long long time...
Having said that if you're just drilling pilot holes in wood it doesn't really matter what you use and if you're drilling steel with a cheaper drill bit, use plenty of cutting fluid and it should be fine.
Who said anything about straightness or size tolerance.....wherever you got that from?
Of course HSS is dependant on its alloy and carbon structure......it's very existence results from the need to machine metals quickly at High Speed.
Naturally the tip and relief angles need to be appropriate for the material being drilled, and if they are, all should be well with the drill lasting well and cutting accurately.
I referred to Dormer in my first post.
John
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