How to slow down power feed?

[Wongster]

Dave,

I've only 3 belt positions with 2 speed each:
Position 1: 80 - 160 rpm
Position 2: 330 - 660 rpm
Position 3: 1400 - 2800 rpm

Now I wish for those variable speed type motor like what I've on the sherline...

This is the cutting oil I'm using, recommended by the shop I bought my tools from locally:





I'm now left with about 3.7mm in diameter to go. Finish has improved with the radius tip carbide insert tool at 0.1mm per pass. Except for the 0.02mm difference in diameter in the length of about 15mm (spindle end bigger), I'm rather satisfied with what I've so far (I've lowered my expectation for now).



You can see from the pic above that I'll have to reset my tool angle again to continue my cut for the last 3 odd mm. Will be looking out for live centre with longer nose.

Have to stop work as I'll be up earlier tomorrow for work.

Regards,
Wong

[EdK]

Wong,

Make sure the tip of the live center is seated into the the tapered hole for it and that there is no swarf trapped in there. That's a lot of taper for such a short length with the end supported as it is. Maybe your tailstock needs to be realigned with the headstock.

That discoloration may be rust if that cutting fluid is water based.

Ed

[Wongster]

Ed,

Amended to read 0.02mm... sorry, missed out one 0... is this still too much? I've no feel all these while how much is too much.

I started without the support as the proxxon lathe tool I was using is too broad to fit between the live centre and the end of the stock. It was only when I swap over to the carbide insert tool that the live centre was brought in. Unfortunately, the tailstock is those fixed type which can't be adjusted. With and without tailstock, I've the taper... enough on the 3-jaw chuck. When I was cutting 1" long piece of steel, I'll have about 0.03mm of taper.

Rust will be bad.... Will it be bad if I sand them off using 1500 grit sandpaper with the flange spinning?

Wong

[DaveH]

Wong,

Use the 1400 rpm speed -see what happens. for turning - not for the 1500 abrasive.

The brown stain is a type of rust, but it is generally formed by the "smoke" you can see the "smoke" being drawn into the chuck.

What will get rid of it is "Navel Jelly" this is a rust remover, so any rust remover will remove it.

I wouldn't use any abrasives even 1500, until you have tried the rust remover.

Some metal polishes will work, perhaps use after the rust remover.


DaveH

[Wongster]

Dave,

I'll try in my next session. Just finished posting to my blog. Time to go to bed for my beauty sleep... lolz...

Regards,
Wong

[EdK]

(04-01-2012, 10:34 AM)Wongster Wrote: Ed,

Amended to read 0.02mm... sorry, missed out one 0... is this still too much? I've no feel all these while how much is too much.

Wong

Wong,

I'd be real happy with only .02mm taper, that's about .0008" for us imperial types. I don't think you need to get better than that.

Ed