I have just purchased a Boxford Lathe

[123hotchef]

I am ready for a lesson now Pete

 

[123hotchef]

had a go on some ali bar Saturday too, is it possible for the 150mm of bar to be bent as when turning it was 1.5mm out of round

 

[123hotchef]

Groves are wider and deeper one side than the other

 

[Brad93]

It may not have chucked up true in your chuck.

Use that dial gauge on a piece of precision bar like a drill blank etc.

 

[123hotchef]

It may not have chucked up true in your chuck.

Use that dial gauge on a piece of precision bar like a drill blank etc.

It may well be the chuck I did chuck it up 3 times. I shall try something else

 

[Brad93]

Start off just facing your bar mate.
Adjust your tool to meet up with the centre of the bar.

Get your tools all set up centre height properly.

That’s going to improve your cut quality loads.

 

[Brad93]

It may well be the chuck I did chuck it up 3 times. I shall try something else

Unlikely there will be too much wrong with the chuck mate.

A three jaw never holds something absolutely true.

There may be a piece of junk in the scroll on the chuck. Easy to strip and sort.

 

[123hotchef]

Start off just facing your bar mate.
Adjust your tool to meet up with the centre of the bar.

Get your tools all set up centre height properly.

That’s going to improve your cut quality loads.

I shall try that tomorrow

 

[Brad93]

I’m gonna have to come back down your way to drop off that mower I’ll stop in for a few hours check everything over

 

[eLuSiVeMiTe]

had a go on some ali bar Saturday too, is it possible for the 150mm of bar to be bent as when turning it was 1.5mm out of round

Just because it's turning true at the Chuck doesn't mean it is at the unsupported end.


Get it close.
Take cuts until you have fresh metal the entire length and diam then mic it.

Abom makes clocking parts in look easy.
Takes practice.
Had a mare clocking parts in for eccentric turning. Made me scratch my head a few times.

Setting my motor rotor in the fixed steady the other day did too.
Ended up sticking my dti base to the spindle and extending it as far as possible.

 

[Pete.]

Setting my motor rotor in the fixed steady the other day did too.
Ended up sticking my dti base to the spindle and extending it as far as possible.

Be very careful when swinging a DTI around on a spindle/chuck/faceplate to centre stuff. One of the demonstrations at the scraping class is to put a mag base on a small surface plate with a dial gauge reading off the face it's stuck to, then turn it over. The reading can move 10 thou just from gravity bending stuff. This is why you should not swing a DTI around a tailstock ram to centre it.

 

[123hotchef]

Unlikely there will be too much wrong with the chuck mate.

A three jaw never holds something absolutely true.

There may be a piece of junk in the scroll on the chuck. Easy to strip and sort.

Just because it's turning true at the Chuck doesn't mean it is at the unsupported end.


Get it close.
Take cuts until you have fresh metal the entire length and diam then mic it.

Abom makes clocking parts in look easy.
Takes practice.
Had a mare clocking parts in for eccentric turning. Made me scratch my head a few times.

Setting my motor rotor in the fixed steady the other day did too.
Ended up sticking my dti base to the spindle and extending it as far as possible.

I shall try that tonight then thanks for the pointers, I would have thought 50mm ali bar would not bend with a 120 mm stick out

 

[Seadog]

I would have thought 50mm ali bar would not bend with a 120 mm stick out

Put a DTI against the back end of the bar when it's mounted, then just push the end towards it. You'll be staggered at just how much deflection you'll get.

 

[123hotchef]

Put a DTI against the back end of the bar when it's mounted, then just push the end towards it. You'll be staggered at just how much deflection you'll get.

I did and I was it was over 1mm!

 

[Brad93]

@123hotchef have you got a revolving centre?

If not what MT Is your tailstock?

 

[Seadog]

MT2 Brad

 

[123hotchef]

@123hotchef have you got a revolving centre?

If not what MT Is your tailstock?

I have some kind of center in the box of bits I shall take a closer look at it later. the tail stock is a MT2

 

[Pete.]

If it's a solid centre keep the spindle below 300 rpm and use lube on it.

 

[Brad93]

Ah that’s a shame as I have a mt3 that gets stuck in my spindle could of tried it in yours

 

[eLuSiVeMiTe]

Be very careful when swinging a DTI around on a spindle/chuck/faceplate to centre stuff. One of the demonstrations at the scraping class is to put a mag base on a small surface plate with a dial gauge reading off the face it's stuck to, then turn it over. The reading can move 10 thou just from gravity bending stuff. This is why you should not swing a DTI around a tailstock ram to centre it.

Wasn't ideal I clamped the mag block on and made sure everything was as tight as possible.
Any better options for clocking something in a fixed steady?

Normally use half a comparator assembly mounted in the rear tool post.
Nice and solid and makes dialing parts in easy but for obvious reasons it was no good in that instance.