drill bits.

[qwakers]

if i had a 3mm hss bit with the tip broken off deep in a hole would a carbide bit be able to drill through it?

 

[123hotchef]

maybe buy one from brad and try, whats the hole in? I tried once was quicker and easier oh and cheaper to remake the work after i messed about for hours

 

[qwakers]

a completely irreplaceable lower control arm in aluminium.

ive bought a carbide end mill to try. worth a shot, anyway.

 

[ukracer]

a completely irreplaceable lower control arm in aluminium.

ive bought a carbide end mill to try. worth a shot, anyway.

My guess is a spark erroder would do it BUT not sure it's cost effective.

 

[qwakers]

you'd be right about cost effectiveness.....

 

[Hood]

Carbide endmill will cut it no problem assuming you have a rigid setup (milling machine/vice/clamps) and can get a bit of spindle speed.

If you are just using a pillar drill, or worse a hand drill then it may be ok or it may not.

 

[brightspark]

can it be drilled in to at the opposite end and drifted out

 

[Hood]

Also that is assuming it is a centre cutting endmill which most are but occasionally they are not.

 

[ukracer]

you'd be right about cost effectiveness.....

Which is a shame as its easy to make a part and let's the machine do it's job.
Problem is it could be earning far more money in the same time.

 

[qwakers]

its a horizontal hole in the aluminium lower control arm on my race car. the irreplaceable part isn't so much being able to get a replacement, but more on the likely impossibility of removing the part from the car without having to cut the subframe (a known issue)

 

[ukracer]

its a horizontal hole in the aluminium lower control arm on my race car. the irreplaceable part isn't so much being able to get a replacement, but more on the likely impossibility of removing the part from the car without having to cut the subframe (a known issue)

Oh...well that makes an even bigger problem. In my experience you ain't getting that done with a pistol drill..

 

[qwakers]

worth a try anyway. its about 10mm of clear hole before hitting the hss, so it may be possible. and i cant make it any worse, if i cant fix it i need to take it off and change it anyway......

 

[JMS1972]

Probably a job for a carbide burr in a die grinder?

 

[qwakers]

i cant find one small enough...

 

[Hood]

Personally I would be wary, snap the carbide in there and you are in a worse state.

You get a fluid that will dissolve steel but not harm aluminium, whether you can get it in depends on the angle it is at I suppose.
The name of it slips my mind at the moment but think it may be Alum, where you can get it I have no idea. I think nitric acid may also work but again getting ahold of some might be problematic.

 

[8ob]

Could this broken drill bit be knocked back out by drilling to it from the other side of the control arm ?

Bob

 

[qwakers]

probably. but considering the conditions and my skill level, there is 0 chance i would get the hole in the right place...

 

[brightspark]

Could this broken drill bit be knocked back out by drilling to it from the other side of the control arm ?

Bob

look at post 7 bob

 

[123hotchef]

how deep is the hole, what is the hole for? what was you drilling for? Any pics of the piece

 

[qwakers]

hole is about 25mm deep, was drilling out a snapped bolt. no pics, sorry.