First Time Lathe Play Advice

[mr haynes]

Cast isnt good for the machine, very abrasive, give it-a good clean and re oil

Brushed it all off afterwards

 

[mr haynes]

Thats presumably some unknown cast iron material, so difficult to judge. I wouldnt be too disappointed with that, but it would be easier to judge with a known grade of steel and a known insert type.

Unfortunately just an old brake disc that was handy and insert was in the lathe at purchase

 

[brightspark]

i wouldnt be machining cast without covering the bed up

 

[mr haynes]

i wouldnt be machining cast without covering the bed up

Live and learn

 

[MattF]

It's only the outer skin of raw cast iron which is abrasive, due to sand inclusion, is it not.

 

[iNf]

Put a straight edge across the disc to see if it's flat or very slightly concave (you don't want it to be convex). Put a washer or shim under your toolpost handle, it looks like it's pointing towards the headstock, potentially resulting in a collision with the chuck when working close up.

 

[MetalMonkey]

Live and learn

It was literally the advice in post #4...

 

[mr haynes]

It was literally the advice in post #4...

Forgot discs were cast, was the nearest suitably shaped piece of metal that didn't run fast enough, and something was getting made into chips asap!

 

[mr haynes]

Put a straight edge across the disc to see if it's flat or very slightly concave (you don't want it to be convex). Put a washer or shim under your toolpost handle, it looks like it's pointing towards the headstock, potentially resulting in a collision with the chuck when working close up.

Will look at handle and find a straight edge

 

[Pete.]

It's only the outer skin of raw cast iron which is abrasive, due to sand inclusion, is it not.

Nope it's abrasive all the way through. Some grades worse than others. Several times I've lost the finish on my cast iron turning and found a big flat worn in the carbide insert.

 

[mr haynes]

Spent a few hours today centering drum in chuck.
Sore wrists, squashed fingers and the departure of the will to live has left it as good as i can get it.
Still to fit the antiwalk threaded rod, but finally, the moment of truth will arrive this weekend.....be my second portion of chips

 

[brightspark]

how accurate have you clocked it up and where from

 

[mr haynes]

Also found a stamping on the boring bar.....

S40V-PTFNPR-22-W

Don't know how relevent that is

 

[mr haynes]

how accurate have you clocked it up and where from

Used the centre hole in the drum as it is the only machined surface
Think it was around 5 thou both in the circle and on the flat face.
Was struggling as kept knocking it out

 

[mr haynes]

Made my second portion of chips today.
Ignore the oopsie, didn't realise had the tool against the face then turned it the wrong way

 

[addjunkie]

Made my second portion of chips today.
Ignore the oopsie, didn't realise had the tool against the face then turned it the wrong way

That looks near enough for “ pit work”.