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This review is from: Silverline DS49 19 Piece HSS Titanium Bit Set (DIY & Tools)I am a manufacturing engineer, on a day 2 day basis i am drilling holes with 0.1mm tolerances and as such am no stranger to forking out around £60 for a set like this. I noticed this set and thought £9, i'll give it a go! Unfortunately the first drill i used was the 7mm, which drilled a 7.5mm hole! That is the only one i have used so far, could just be a faulty one that slipped through the net, just thought i'd give you a heads up as i can't in good faith use these drills on components with high tolerances.
I have a (£80) tin coated set and every drill gives you the size it tells you within a hundredth of a mm (truly precision ground).
On a brighter note the components i drilled were just clearence holes and the drill went throught 32 stainless steel components without so much of a tarnish on the coating!
you could however sharpen the drills, so both shoulders are of equal angle and length, however in the process you would lose the titanium coating!!!!!
If a 0.5 mm bigger hole is not a problem then i would definately go for them, is so buy some expensive hertel drill bits instead.
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Showing 1-2 of 2 posts in this discussion
Initial post: 7 Jun 2012 20:50:32 BDT
I have an interest in your comments about the drills you used..a couple of questions.
1. Were the holes baggy or just the incorrect size...
2. Did you drill pilot holes then take them up gradually.
If the drill you used is marked up incorrectly that is a major problem !
Posted on 4 Jun 2013 07:22:38 BDT
Roberto Nike says:
Are you for real?
Huey: "I have a (£80) tin coated set"
Then why you bought that one?
I doubt you have either.
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