Lathe spindle speed and finishing speed/feed

Lathe spindle speed and finishing speed/feed

This topic has 4 replies, 3 voices, and was last updated 20 December 2018 at 12:29 by JasonB.

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19 December 2018 at 09:31 #386409
Men Ifr
Participant
@menifr84251
I’ve been looking for but struggling to find a quick rule of thumb for lathe spindle speed. Something like work diameter divide by 1000?

Also how do I change parameters for finishing cuts? Higher spindle speed plus less feed rate? What is the practical limit for this?
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19 December 2018 at 09:31 #16050
Men Ifr
Participant
@menifr84251
Is there a quick rule of thumb?
19 December 2018 at 09:59 #386413
John Haine
Participant
@johnhaine32865
Try this:

**LINK**

In the first post is a link to a table.
20 December 2018 at 12:19 #386630
Men Ifr
Participant
@menifr84251
That's useful though may be good to know if that's for HSS or carbide tools and there are no feeds.

I found this very useful diagram from cnccookboook

So the surface finish would seem to be limited by a feed so slow that the tool rubs not cuts and spindle speed limited by tool temp

What's interesting is I've turned parts with much higher spindle speed than the the table from the 1st link with no problems – if that is a table for HSS tools should it be multiplied by 4 for carbide (even cheap carbide) tools? Is there a limit surface speed for aluminium because it melts?

I've took feed rates below

Which gives 0.5 to 0.05mm/rev in metric
20 December 2018 at 12:29 #386635
JasonB
Moderator
@jasonb
This went with the table

THE CNC table is more likely for milling than turning. And your feed chart is a bit high for most hobby use, try about 1/5th of that.
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