How much is too much...

[Tinbasherdan]

As I posted, I made an adaptor block for the spindle nose on the Taylor mill to take er40 collets. I’ll not lie, I’m not the greatest machinist in the world and so I’ve got about 12 thou runout of the cutter shank now.
It still quite happily cuts, although oversize to the cutter which in and of itself isn’t an enormous issue to be fair but what does the forum collective think

 

[roofman]

0.3mm...i suppose it would still cut pretty well but might affect the finish on finer stuff. It would not bother my milling skills at home but would be really annoying to have a 12thou runout on my lathe.

 

[Pete.]

!2 thou runout on a milling cutter is 12 miles. You are not going to be satisfied with it ultimately.

 

[tom2207]

As I posted, I made an adaptor block for the spindle nose on the Taylor mill to take er40 collets. I’ll not lie, I’m not the greatest machinist in the world and so I’ve got about 12 thou runout of the cutter shank now.
It still quite happily cuts, although oversize to the cutter which in and of itself isn’t an enormous issue to be fair but what does the forum collective think

Its better than the one you had when you started ,,,, and the next one will be better again if it bothers you , so really your winning either way ,...

 

[Tinbasherdan]

!2 thou runout on a milling cutter is 12 miles. You are not going to be satisfied with it ultimately.

You are right, ultimately it was a quick fix attempt that works within reason.

 

[Kram]

What mounting does the mill have? Does the mount have any play so that it can be clocked in?
Can you set it up in place and re cut the taper?

 

[Tinbasherdan]

What mounting does the mill have? Does the mount have any play so that it can be clocked in?
Can you set it up in place and re cut the taper?

I think the answer will be to send it to Pete to have it nodded and ground by someone that isn’t a ham fisted baboon.

 

[Brad93]

get something ground up in nice EN24 and it will last a life time.

 

[Tinbasherdan]

I think If I was doing it again I’d have fitted a block to the spindle nose first, clocked it in in the 4 jaw and then cut the taper for the collet

 

[RichardM]

Have a go at making another, nowt to lose apart from a bit of time and steel. Or if the mill taper is good, can you set the head at required angle for er40 and mount the cutting tool on the table. Bring the table up to skim?

 

[Tinbasherdan]

Have a go at making another, nowt to lose apart from a bit of time and steel. Or if the mill taper is good, can you set the head at required angle for er40 and mount the cutting tool on the table. Bring the table up to skim?

Fixed head unfortunately

 

[Tinbasherdan]

So.... I decided to have a day of making swarf today and made a new nose for the spindle. Threaded it, mounted it to the spindle then clocked the spindle in the 4 jaw within a thou, cut the taper etc and......

it’s worse. I have no idea how, but the whole nose is running out by a country mile now

 

[addjunkie]

Sure youve herd the expression measure twice cut once etc.

if you measure less you find less errors. if youd not measured the run out youd have been happy.

on-a serious note. How much run out is there on the spindle?

 

[Brad93]

So.... I decided to have a day of making swarf today and made a new nose for the spindle. Threaded it, mounted it to the spindle then clocked the spindle in the 4 jaw within a thou, cut the taper etc and......

it’s worse. I have no idea how, but the whole nose is running out by a country mile now

For spindle work you need to clock it within a tenth or two.

Bear in mind something can be running true on your indicator in one plane but be a mile off in another plane.

Have you got some pictures of the part and a picture of it setup in the 4 jaw?

 

[Tinbasherdan]

For spindle work you need to clock it within a tenth or two.

Bear in mind something can be running true on your indicator in one plane but be a mile off in another plane.

Have you got some pictures of the part and a picture of it setup in the 4 jaw?

I haven’t, I’m crap at taking pics at the best of times- always forget til I’m done. It’s back in the mill at the moment and I’ve fallen out with it

 

[Tinbasherdan]

Sure youve herd the expression measure twice cut once etc.

if you measure less you find less errors. if youd not measured the run out youd have been happy.

on-a serious note. How much run out is there on the spindle?

Oh it’s noticeable to the eye. I’ll put a clock on it in a minute when I’ve stopped seeing my hoop with the whole shebang and see what it’s running at now

 

[Brad93]

Have you checked the taper for contact?

Im not fully aware of what you're doing. Are you modifying a toolholder to fit the weird taper in your mill?

 

[Tinbasherdan]

Have you checked the taper for contact?

Im not fully aware of what you're doing. Are you modifying a toolholder to fit the weird taper in your mill?

Just making a block that screws onto the spindle nose to take an er40 collet

 

[Brad93]

Just making a block that screws onto the spindle nose to take an er40 collet

So there's no taper?

 

[Seadog]

It sounds like you haven't accurately bored the parallel register (assuming that it has one), or there's some swarf or a ding on the register face.