Thread: Used MT2 shank drill bits or new straight shank

What are you drilling? If its 6mm ply then the straights will be fine but if it's steel they would struggle.

Originally Posted by BobL

What are you drilling? If its 6mm ply then the straights will be fine but if it's steel they would struggle.

Thanks Bob,
Definitely not wood - I already have some of the "traditional" wood bits for that.

Mostly I'll be in brass or ally, sometimes steel.

I'll go for the MT2 shanks.

Thanks.
J

Originally Posted by ventureoverland

Thanks Bob,
Definitely not wood - I already have some of the "traditional" wood bits for that.

Mostly I'll be in brass or ally, sometimes steel.

I'll go for the MT2 shanks.

Thanks.
J

I use Forstner bits to drill ally - lots of method as coolant/lube and quite high drill pressure is needed but they they make a nice clean hole, - pity fractional sized aren't available.

Originally Posted by ventureoverland

Guys,
I need a 19/32 and 3/4 drill bit. EBay has a few used Sutton MT2 bits and also new Sutton straight shank versions.

Is there a difference in quality between the two variants?

You would expect that both being the same brand the quality of steel would be the same. I would personally go the MT2 route as I think they will hold better.
Are you going imperial for any particular reason? I have some duplicate metrics if that is of any interest.

Michael

You will need one drill for brass and another for steel unless you plan to re-grind each time. Best to trim the cutting edges back to a neutral or slightly negative rake for brass to prevent it from grabbing or behaving very badly. Makes for a smooth operation.
Combustor.

Originally Posted by BobL

I use Forstner bits to drill ally - lots of method as coolant/lube and quite high drill pressure is needed but they they make a nice clean hole, - pity fractional sized aren't available.

I've never tried a Forstner bit- I'll give it a go. I use stepped bits for aluminium. They leave beautiful holes but are obviously only good for sheet stock.

Unless the used drills are obviously bent or are chewed up along the flanks than I'd be going for them. For the same reason that Michael as already stated. Theres always a risk that a used drill might have a slight bend in it that you cant see until you run it, but on one that size you would probably be ok.
If its a good quality drill, then theres not a lot that can be done to wreck it without it being blindingly obvious in the pictures, except for a slight bend.

bollie7

Originally Posted by jack620

I've never tried a Forstner bit- I'll give it a go. I use stepped bits for aluminium. They leave beautiful holes but are obviously only good for sheet stock.

That should be "metho", not "method", as the coolant