What are you machining?

[grim_d]

I would imagine so but you could just as easily regrind the tool as is until it just kisses the back edge, assuming that you can accurately set the angle of the grinder you are using.
In reality the tool above is likely very close to the required angle anyway.

For a vice screw that looks like it was rolled using some very worn tooling I'd imagine it will be so Insignificant as to make zero difference, still it's good to know that, every day is a school day.

 

[slim_boy_fat]

but plenty of people get very nice finishes on tiny little lathes.

Kinda my thinking in my question re the tooling, but it got shot down.

 

[zx9]

Up date on my hammer.



Today was maths to work out the offset of the tailstock and I hit the length of taper to within 1/2 a mm and actually turning between centres with a lathe dog. The finish of taper is straight from the tool, I could have run some emery tape over it but what is the point in that, this is supposed to be a learning project that I can will look back on and judge my progress.

 

[mtt.tr]

Had enough for one day pretty productive as im leaving mrs calls, "dont forget the transformer oh and the knob"

Very quick rummage for some ali, very quickly centre punch the holes and drill then onto the lathe

Not overly pleased but will do what swmbo wants.

Couldn't remember the thread diameter mind grrrhhh! Will finish of and deburr when threaded

 

[Hood]

Had enough for one day pretty productive as im leaving mrs calls, "dont forget the transformer oh and the knob"

I was thinking maybe that had something to do with the ripped jeans the last day.

 

[mtt.tr]

I was thinking maybe that had something to do with the ripped jeans the last day.

I haven't the machinery for such a thing

 

[grim_d]

Vice screw for @qwakers, EN16T. M16x4 trapezoidal. First proper metric thread cut on this machine.

Discovered today that the travelling steady I have is for a 9" L5....something else to make, it cut just fine anyway. Fits the nut lovely



Pressed the screw into an end for the handle and cut a nice groove for welding.

Welded up (not on the lathe)

All done, very happy with it.

 

[mtt.tr]

Vice screw for @qwakers, EN16T. M16x4 trapezoidal. First proper metric thread cut on this machine.

Discovered today that the travelling steady I have is for a 9" L5....something else to make, it cut just fine anyway. Fits the nut lovely

View attachment 230299

Pressed the screw into an end for the handle and cut a nice groove for welding.
View attachment 230300
Welded up (not on the lathe)
View attachment 230301
All done, very happy with it.
View attachment 230302

Well done.

 

[qwakers]

Vice screw for @qwakers, EN16T. M16x4 trapezoidal. First proper metric thread cut on this machine.

Discovered today that the travelling steady I have is for a 9" L5....something else to make, it cut just fine anyway. Fits the nut lovely

View attachment 230299

Pressed the screw into an end for the handle and cut a nice groove for welding.
View attachment 230300
Welded up (not on the lathe)
View attachment 230301
All done, very happy with it.
View attachment 230302

thatll do very nicely thanks dude

 

[minimutly]

Last night I resurfaced a bloomin big brake stator plate out of some tractor or other. In the 4 jaw on the Triumph, it was 24.5 inches in diameter, passed the leadscrew bu 4mm, thread cutting indicator and gap removed. Had to offset it to get it to turn and add weight to the t slots in the chuck to "balance". Took ages to clock it in, 14thou removed. It was some sort of cast steel, no dust but fine short chips.
I felt I needed an emergency stop, standing to the right of the swirling mass, with the stop lever in the firing line...

 

[Brad93]

Vice screw for @qwakers, EN16T. M16x4 trapezoidal. First proper metric thread cut on this machine.

Discovered today that the travelling steady I have is for a 9" L5....something else to make, it cut just fine anyway. Fits the nut lovely

View attachment 230299

Pressed the screw into an end for the handle and cut a nice groove for welding.
View attachment 230300
Welded up (not on the lathe)
View attachment 230301
All done, very happy with it.
View attachment 230302

I’ll get you some measurements off my steady if you like.

still not managed to find a fixed anywhere yet. I’ve got a lump of 50mm Steel here that may be repurposed. Not as good as cast iron but will do the job.

 

[grim_d]

@Brad93

Don't worry about it, I'll likely end up buying one instead.

I've given up on a fixed, I wouldn't pay the money they command anyway. The good thing about making one from steel is you can cobble one together from bits of scrap.

 

[Seadog]

A piece of steel

More later.

Also a groove in my dead centre. Why dead centres never have a tang (at least not the ones I own or have ever come across) beats me. They're a right pain to get out of the tailstock. Having a need to use one today, the thought struck me that I could use my chuck wedges if only there was slot in it.

It was hard as you like so got attacked with the angle grinder. After that it was simple to clean up the slot.

Works well.

 

[Hood]

...Why dead centres never have a tang (at least not the ones I own or have ever come across) beats me. ...

Does your tailstock not wind back far enough to eject even without the tang?

 

[Seadog]

I wouldn't have bothered with the groove if it did

 

[grim_d]

Wouldn't a spacer on a magnet stuck to the end of the centre done the same thing? Then you don't have to modify your tooling.

 

[Hood]

I wouldn't have bothered with the groove if it did

Well you never know, can't say I recall a lathe that doesn't, well except my CNC lathe but that is only because Churchill decided to fit a hydraulic cylinder to it with no ejection method

 

[Hopefuldave]

This week, a ittle "pot chuck" and cap to hold some taper-roller outer races so I could put a circlip groove in as a substitute for Timken 1922B flanged Imperial taper rollers, as fitted to the Holbrook lathe QCGB - and machined those, very impressed with the Horn grooving tool! Lots of glowing ribbons coming off, flying sparks, only shattered one insert
Made a fairly hefty slide hammer with 1/2" BSF end to pull the QCGB shaft out through the rusted-on bearing races awaiting replacements, and an adaptor for the end to pull the flanged races out of the casting - obstinate blighter, result of several years with rancid stale coolant that leaked in through a missing gasket into the sealed QCGB

Got the QCGB apart though (the usual Holbrook Chinese puzzle), parts are cleaning up in the E.G.B.E.R.T.* overnight and tomorrow, housing will get a clean up and coat of paint before reassembly with fresh bearings - it was getting a bit grumbly with The World's Worst Bearings...

Dave H. (the other one)

* Electrolytic Gungy Bubbling Encrustation Removal Tank

 

[Seadog]

Well you never know, can't say I recall a lathe that doesn't

I suppose that it's possible that the feed screw has been shortened sometime in the last 57 years, and I certainly don't have any recollections from my school days when I was using Boxfords.
It's always been like it, so I assumed that that's how it should be.

 

[minimutly]

Here it is with a threading style tool
Side clearance only.

View attachment 229877

From top

View attachment 229878

Add some top rake

View attachment 229879


View from the top, dotted lines showing original angle.

View attachment 229880

Makes perfect sense. So would you grind it making an allowance for the combination of top rake and side clearances?
Again for amateurs like me...