This is true BTDTGTTS. They are however brilliant on normal tiles. You can apply pressure (drill off) until you hear a 'crunch' noise and the sharp point penetrates the glaze, then carry on. No slipping at all.
You can use HSS drills on normal tiles too. Make a center by using a tile scribe - or even a center punch used with care. And a slow drill speed with steady pressure. I'm not too keen on those multi-purpose drills as they do nothing well. But realise they can be handy if carrying everything with you.
Thanks for posting that Fred, interesting read. I'd been looking around but didn't realise they were called shot towers.
I'm pretty much sold on them for that reason. Going back down 4 flights of stairs to get another drill bit is a PITA!
TMH's first law of stairs; the more flights up you are, the more often you need to go back to the van.
One way round that, is to obtain some high carbon steel bushes with the right size hole in the middle and a bush holder to clamp to the job, even it it means drilling another hole to attach it. The closer the drill bit is to the clamp, the better. It helps to prevent any circular rotation of the bush holder.
Dave
I had no intention of buying them thanks :-) I was just curious to know a bit more about them.
Dave
That was one point I could not understand. I always thought that liquid nitrogen was the coldest, easily available thing to use.
Dave
Hi Dave,
I also saw those adverts on IdealWorld and was very impressed. I had some s tainless steel sheet that I needed to drill and as my regular HSS drills we re unable to cut the material I thought that that these "drillallbits" woul d be the answer. I missed the IdealWorld deal and so I decided to go direct to the company
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I've never paid return postage costs after entering a dispute with Paypal where the goods weren't as described. Although I've only done this a few times in all the years I've used it.
tainless steel sheet without any problem. The company (Triple x Trading Ltd.) does not answer emails and I had to use the PayPal disputes process to obtain a refund. Note that it costs £6.50 to post them back which is not refunded. In short, the product does NOT do what the adverts (TV and website) say it will do so save yourself time, money and stress by avoiding this company and its products.
The problem is the method you are using,Any ordinary HSS drills (cobalt better) are capable of drilling mild steel or ordinary stainless. Hand electric drilling should be at slowish speed and with as much pressure that you can exert without breaking the drill(takes a bit of practice) Your problem is probably not enough pressure.
I have seen moulds to make musket balls. Two halves in a pair of "tongs". Looked like they were intended for use on the (battle?) field after you'd raided the local church roof.
I think the "long drop in air" method is for smaller shot than musket balls:
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