What are you machining?

[Brad93]

What is the runout like? I need a 3jaw for a revolving tailstoxk

 

[Tigman]

I had five minutes with it , wasn't too bad need to spend a bit more time on it , according to my eyes 0.01mm , will report back when I've had a play with it

 

[Tigman]

Right checked the run out on this new chuck , according to my cheap gear 0.03mm which is just over a thou, not sure if I can make that any better , can you adjust a D-8 chuck ?
6 pins

 

[Tigman]

 

[brightspark]

its a 3 jaw self centering chuck none of them are totaly accurate

 

[Tigman]

I'm more than happy with it , Brad asked the question !

 

[iNf]

They are pretty grotty aren't they? Wasn't sure if it was just me, it usually is. Worth a try though to experiment with. Maybe one with fewer teeth would be better? I'm not spending any more money to find out.

Definitely need fewer teeth for cutting that sort of depth. Those high tooth count saws are for shallow slots. Same sort of principle as a hacksaw blade, you wouldn't cut that deep/wide with a high tooth count blade. You need a 36 tooth or similar. Though they'll all wander if you do really deep.

 

[Maker]

I had a local fabricator make a nose cone for a space ship with a 75mm hole in the top, then realised I actually need it 5". Luckily a 40 taper Bridgeport (clone) has an enormous work envelope.



I tried to trepan it out but it made a terrible noise, and interpolating with a small endmill was no better, so I resorted to taking over two hundred, approx 0.2mm passes with a boring head. Never again.

 

[E T]

Made a MT2 annual cutter holder for the tailstock of the South Bend.
It took two tries because I set the taper attachment not accurately enough on the first one. Second one came out good.
First test on a bit of scrap was promising.

 

[ukracer]

I had a local fabricator make a nose cone for a space ship with a 75mm hole in the top, then realised I actually need it 5". Luckily a 40 taper Bridgeport (clone) has an enormous work envelope.

View attachment 453414

I tried to trepan it out but it made a terrible noise, and interpolating with a small endmill was no better, so I resorted to taking over two hundred, approx 0.2mm passes with a boring head. Never again.

It's often the same with a lathe. Takes ages taking sensible cuts and a CNC makes it look like child's play.

 

[oldbikedavey]

its a 3 jaw self centering chuck none of them are totaly accurate

Only Allah is perfect ....

 

[pawsnizzy]

Only Allah is perfect ....

Didn't he make hexagonal wrenches

 

[oldbikedavey]

Didn't he make hexagonal wrenches

Only the geometry bit.
The perfection is a dead giveaway....

 

[Cheesie]

First slots on the mill, on any mill I'm going to get a dro, what's everyone's preference,and a bit of skimming

 

[ukracer]

First slots on the mill, on any mill I'm going to get a dro, what's everyone's preference,and a bit of skimming

View attachment 453643 View attachment 453644 View attachment 453645

What is it in the last photo?

 

[voipio]

An edge-forming tool aka bead roller.

 

[Dcal]

Fancy bead roller

 

[Agroshield]

I tried to trepan it out but it made a terrible noise

A lot of that is becasue the object is thin-walled and bell-shaped. It vibrates and resonates in strange ways. You can sometimes mitigate this by extra support under the piece you are cutting (e.g. sacrificial plywood) or wrap the whole thing in a blanket.

 

[iNf]

Milling a square on a scrap automotive bolt, using an old 'Chinese collet' chuck converted to a 12 sided collet block, to repair a very old pair of garden shears

 

[Hood]

Made a couple of stainless pad pins up for the parking brake on my bike.
55mm long, hex is 8mm, thread M10 x 1.25 and shaft is 6mm.