Lathe Tools

[Pete.]

DavidA:
The cross slide on my Sieg C3 which is metric is marked 0.025 mm per division. It is also marked 0.001" which are obviously not equal. I suspect DaveIOM is correct, it is a 2.5 mm pitch leadscrew thread. Treat it as 2.5 mm per turn.

Gary

Mine is the same. The difference in a full turn is not even 2 thou, so rough it close and then measure for your final cut. To make things even more weird, the cross-slide thread on my lathe is specified on the drawing as an imperial OD but metric pitch

[DavidA]

Pete,

That is more or less what I do.  Here is a picture of my set up.  It's probably more accurate that using a dial.




Dave.

[Trebor]

Just found out that I have a mixture of metric and imperial dials and feed screws on my carriage so at the moment I haven't a chance in hell of sorting it out without spending more money. 

[Pete.]

Just found out that I have a mixture of metric and imperial dials and feed screws on my carriage so at the moment I haven't a chance in hell of sorting it out without spending more money. 

Shouldn't be too hard to fix. Do you know what pitch the screw is, exactly? I put a dial gauge on my cross-slide and measured mine over 1, 2 and 5 turns.

[Trebor]

I did find out that my feed screws and dial for 1 rotation move tool 2mm metric / 1/8 imp. Tested mine and its already been converted apart from the top dial is imperial. So it's turned out a cheap fix.
Why is my coolant rusting my bed ? That's the next topic !!! lol

[Pete.]

I did find out that my feed screws and dial for 1 rotation move tool 2mm metric / 1/8 imp. Tested mine and its already been converted apart from the top dial is imperial. So it's turned out a cheap fix.
Why is my coolant rusting my bed ? That's the next topic !!! lol

Doesn't make sense. 2mm pitch and 8tpi are nowhere near the same.

[DavidA]

Trebor,

Got to agree with Pete. Something wrong there.

RE the rust.  Your coolant mix is probably too weak.

Dave.

[Trebor]

Well the metric dials are 0 to 40 and imp 0 to 100. I have feed screws that move tool post 2mm on full turn. I did check this before speaking to Myford. I have metric cross feed dial and feed screw, metric top feed screw and imperial dial.

[Trebor]

sorry about the pictures this is the only site I have trouble loading pictures on !! just got to get used to it.

[DavidA]

How far does the topslide actually move for 1 full turn of the dial.  Measures with a dial gauge ?

Dave.

[Trebor]

I only have a vernier gauge but on 1 full turn it moves 2mm.

[DavidA]

Then if that 40 on the dial was read as 4.0 it would seem to indicate the amount of reduction on the diameter per revolution.  I.e 2 x 2

Anyone agree ?

Dave.

[Pete.]

Yep, direct-reading dial, 2mm travel is 4mm off the OD.

[Pete.]

Trebor is the compound slide also 2mm pitch? If it is, for now all you have to do is put some masking tape around the dial and double all the numbers with a felt pen.

[Trebor]

Trebor is the compound slide also 2mm pitch? If it is, for now all you have to do is put some masking tape around the dial and double all the numbers with a felt pen.

You have lost me now I'm a novice chap. Both the cross and top slides have the same feed.

[garym]

Hi Trebor,

Compound slide = top slide on most lathes. Does this help?

Gary

[Trebor]

Cheers I've learnt something else today