Pratt & Whitney lathe

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Anonymous
Pratt & Whitney lathe 2016-06-03 02:42:55 Post No. 1003031
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Pratt & Whitney lathe Anonymous 2016-06-03 02:42:55 Post No. 1003031 [Report]

Got this old Pratt & Whitney 16" x 54" lathe hooked up. Set the feed rate to 60 TPI (slow as it goes) and engaged power feed on a light surface pass on a rod of crap hot rolled, and lo and behold terrible surface finish. I think it's feeding too fast.

Any ideas why? No I'm not using the half nut as a power feed.

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Anonymous 2016-06-03 02:44:12 Post No.1003032
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Anonymous 2016-06-03 02:44:12 Post No.1003032 [Report]

>>1003031
tool was a rather large insert, an elongated diamond shape. Probably carbide.

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Anonymous 2016-06-03 03:31:19 Post No.1003057
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Anonymous 2016-06-03 03:31:19 Post No.1003057 [Report]

Can you show us a close up of the finish?

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Anonymous 2016-06-03 04:08:22 Post No.1003066
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Anonymous 2016-06-03 04:08:22 Post No.1003066 [Report]

File: Pratt & Whitney 16 x 54 threading chart.jpg (524 KB, 1997x1123) Image search: [Google]

524 KB, 1997x1123

>>1003057
Not at the moment, too tired from hooking up the phase converter.

ohhh...

I just realized I didn't have the right letter selected, my mistake.

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Anonymous 2016-06-04 17:15:10 Post No.1003621
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Anonymous 2016-06-04 17:15:10 Post No.1003621 [Report]

go faster with carbide
or use HSS bit to finish
mild steel a shit

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Anonymous 2016-06-04 18:50:50 Post No.1003647
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Anonymous 2016-06-04 18:50:50 Post No.1003647 [Report]

>>1003621
May also be tool centering

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Anonymous 2016-06-05 00:49:56 Post No.1003800
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Anonymous 2016-06-05 00:49:56 Post No.1003800 [Report]

>>1003031
Uhh, you sure you mean TPI (Threads Per Inch)? That would imply that you are threading. Feed for a lathe should be given in Inches Per Revolution (and therefore be a decimal inch. Not anything nearing a whole inch).