hss
they cost about a grand to buy so hiring is the way - you may need to buy the appropriate bit though....
never really had to buy anything like it before but can I buy big drills that go in to a normal drill ie they have a smaller shaft then it turns into
a big drill
something like 45mm
ta chris
Hi mate,
I think the type youre on about are known as blacksmiths drills. They dont go up much past about 20mm so that means your into hole cutters for that
sort of size.
What are you cutting?
Rgds
Richie
Buy a set of HSS tank cutters. They will cut big holes in pretty much anything.
If you want a drill around 45mm the only ones you will find are morse taper shank ones. A normal 13mm chuck would never be able to hang on to a drill
that big, and its unlikey the drill (machine) itself would cope either.
David
alright rich Ive sent your bolts by the way
and Im cutting some alloy phoned the local metal place about some blacksmith drills so will sort that out if theyve got one
whats the tank cutters dave
ta chris
If its thick metal you are drilling then you want one of these.....
hss
they cost about a grand to buy so hiring is the way - you may need to buy the appropriate bit though....
quote:
Originally posted by zxrlocost
alright rich Ive sent your bolts by the way
and Im cutting some alloy phoned the local metal place about some blacksmith drills so will sort that out if theyve got one
whats the tank cutters dave
ta chris
so do they just fit in my drill
ta chris
Yeh the arbor isnt a fat diameter. Would a hole saw not go through the alloy? What sort of thickness are we talking?
Rgds
Richie
1 inch thick
ta chris
Ah righty, something fairly heavy duty then 
Rich
yep ill keep looking would like to buy a tool not rent
You might manage 1" thick 45mm dia with bi-metal hole saw -- if you keep well cooled and the speed right down.
[Edited on 18/1/06 by britishtrident]
I have a few blacksmith's drills in 3/4" & 1" - they're very hard to use in a hand-held domestic electric drill, and put a
huge load on the drill. You would probably have to work your way up to the final size in increments.
BTW: 'blacksmith's drill' is a good description - they're crude and not particularly accurate.
Do a Google on Tracy Tools for a cheap source via mail order (but don't use your credit card, 'cos they charge you a bundle). Send an order
with a cheque and you'll get your drill(s) back by return post - they're very good at that.
David
ok ta
I have a few large drill bits whose ends I had reduced to 10mm in a lathe. It´s the cheapest way to go, I think.
quote:
Originally posted by David Jenkins
I have a few blacksmith's drills in 3/4" & 1" - they're very hard to use in a hand-held domestic electric drill, and put a huge load on the drill. You would probably have to work your way up to the final size in increments.
Chris, what about getting a quote from the "water jet" guy mentioned in this thread?
ill find out cheers mate
coming from another angle....what is it your trying to make?
is there another way to achieve what you need?
Nick
Ok, if its an inch thick, a tank cutter is no good..
These are though:
Available in 44mm (closest you will get) from RS item number 315-5951 and are £8.60 each, not supplied with guide drill/arbor though.
Arbor to suit is item 315-5872 and is £11.55
David
[Edited on 18/1/06 by flak monkey]
[Edited on 18/1/06 by flak monkey]
quote:
Originally posted by DaveFJ
If its thick metal you are drilling then you want one of these.....
they cost about a grand
If you fancy a day out in Yorkshire I have a Rotabroach. I think the biggest bit I've got is 43mm though.
i use similar to what flat monkey suggests on steel car panels should do ally ok wont be fast though
i paid more like £30-£40 for steel cutting blade
If its 1inch thick alloy, a decent tank cutter will cope. Use PARAFIN to lubricate/cool it as it cuts. This will help to stop it clogging the cutting
edges. DO NOT ATTEMPT IT unless you put it in a pillar drill and clamp the work piece !
Hole saw, drill from both sides, nice and slow using paraffin as coolant.
ok cheers
Trepanning tool any good?
Best picture i can find 
quote:
Originally posted by ayoungman
If its 1inch thick alloy,
Sorry to hijack this thread
Project7, where are you in Dartford ?
I'm in Erith
What about a rotazip , Iv'e never used one but remember the ads
quote:
Originally posted by flak monkey
Ok, if its an inch thick, a tank cutter is no good..
These are though:
Available in 44mm (closest you will get) from RS item number 315-5951 and are £8.60 each, not supplied with guide drill/arbor though.
Arbor to suit is item 315-5872 and is £11.55
David
[Edited on 18/1/06 by flak monkey]
[Edited on 18/1/06 by flak monkey]
quote:
Originally posted by nick205
coming from another angle....what is it your trying to make?
is there another way to achieve what you need?
Nick
Expensive hole saws , Starrett or similar available from electrical wholesalers. Make sure you get an arbour with it they tend to fit about 4 or 5 saw
sizes then you have to change arbour. Used sensibly they get through anything and with even a cheap pillar drill can be set up for fishmouthing round
tube.
Caber
quote:
Originally posted by gazza285
If you fancy a day out in Yorkshire I have a Rotabroach. I think the biggest bit I've got is 43mm though.
Carver clamp.
Buck and Hickman (buckhickmaninone) do all manner of holesaws.
By the time you put a 44mm holesaw through, then dress up the inside with a half round or round file, the hole is more than likely to be 45mm or
bigger. You may be best to go through with a 43mm, and take the remainder out with a file.
Bush engineering at its best!
Syd.
[Edited on 19/1/06 by Syd Bridge]
ta everyone
quote:
Originally posted by gazza285
Carver clamp.