PM-1660TL

ddickey said:
You need to measure with a mike. Are you trying to align the tailstock?
Click to expand...

I am turning between centers. I leveled the lathe as best as I can, and I hope that the ways are straight (i.e. not twisted).

For the time being, I am assuming that the tailstock offset was set correctly at the factory.
 
I took very careful measurements with a micrometer, and the taper is .0042” over 16” (“2.6 tenths per inch”).

image.jpg
 
Last edited:
Erik, just curious. What are you trying to accomplish by turning between centers and measuring for taper? Serious question.
 
Eric, what geometry of HSS are you using(picture)?
 
mikey said:
Erik, just curious. What are you trying to accomplish by turning between centers and measuring for taper? Serious question.
Click to expand...

This arose out of my desire to level the lathe (in such a manner as to minimize twisting in the ways).

I got the machinist’s level pretty much dead on laying on the ways, as well as on the cross slide. That should establish a minimal twisting of the ways.

I was wondering how much of a taper I would cut with the ways as level (“normal”, hopefully) as I could get them.
 
Last edited:
Interesting, I have not seen those. How does the cutter sit when it's addressing the material at 29.5*?
 
Aukai said:
Interesting, I have not seen those. How does the cutter sit when it's addressing the material at 29.5*?
Click to expand...

The Seller doesn’t always have them in stock, but here is an auction from the Seller, “cnctoolexpress”:

www.ebay.com

TURNING AND BORING TOOL SET HSS FOR 3 IN 1 MACHINES 1/2" | eBay

Find many great new & used options and get the best deals for TURNING AND BORING TOOL SET HSS FOR 3 IN 1 MACHINES 1/2" at the best online prices at eBay! Free shipping for many products!
www.ebay.com
 
Last edited:
@Aukai Here is how I present my facing tool with the compound set to 29.5 degrees. The QCTP is squared up to the chuck:

image.jpg
 
As others have said:

1) That's a pretty horrible finish. If you're sure the grind is correct and the tool is set at the correct height, then it's speeds and feeds. As others have also said, seems like you're babying it wayyyyy to much. I take much more aggressive cuts on my little pre-war 10" Logan. You need to take some meat out of it to get a decent finish.

2) The taper you're measuring is almost 100% due to misaligned tailstock. Not (necessarily) twist in the bed.
 
You must log in or register to reply here.
Back
Top