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hammernanvil
06-19-2019, 07:45 PM
Iíve been running an HLVH at work without
problem for a few weeks until today.

Up until today facing a piece of round stock
hasnít been a problem. I noticed today when
I was facing that when I dialed in .020 for
removal when it got to the center of the part
the carriage had apparently backed off approx.
.006 and of course didnít leave a good finish.

I was using the power feed to face like I
normally do and never had to lock the carriage
to get it to stay in place until today.

Iím not sure what might have changed, I
use collets and the lathe chuck, and I was
using a collet today. The only thing different
I can think of is I was facing 1Ē dia. stock
which is just a little bigger than what Iíve
been machining.
Iíve been using the same style insert at
a slow rate of rpms and feeds, and the
steel has just been 1018. The insert may
have been worn a little but it wasnít chipped.

Iím wondering if the carriage is supposed to
lock somehow when you use the power feed
or do you always have to lock it manually?

Any help is appreciated.

JRouche
06-19-2019, 07:53 PM
Not a hardinge but all my lathes get manually locked when finish facing. JR

Maybe its a lock like my southbend. Where the grip can be adjusted. Maybe its always been a lil tight and someone else loosened it. JR

Bented
06-19-2019, 08:23 PM
The part is moving, it is unlikely that such a lathe has developed a crossfeed problem.

Chuck or collet?

hammernanvil
06-19-2019, 08:52 PM
I don’t think the part is moving. If the part
was moving, then why is position of the
DRO changing?
If the part was moving it would be sliding
back into collet farther not pushing the
carriage out.

Leadfootin
06-19-2019, 09:26 PM
My HLVH has a carriage lock and it is generally needed when facing. Also tool sharpness is a substantial factor causing it to push away from the work.

Glug
06-19-2019, 09:48 PM
Holy cats you broke the Hardinge!

RB211
06-19-2019, 09:57 PM
Try a new insert or rotate it to a new edge. I am in agreement that when the insert dulls, cutting forces increase. Or you can lock the saddle and use the same insert.

Mark Rand
06-20-2019, 08:37 AM
Congratulations! You just have learned why the HLV (and -H) have a nice, ergonomic, carriage lock sitting there waiting to be used...

hammernanvil
06-20-2019, 09:21 AM
LOL

Doozer
06-20-2019, 11:03 AM
Note: Do NOT use water-based coolant on a HLV-H.
It will kill it.

-Doozer

Doozer
06-20-2019, 11:05 AM
And when you oil the countershaft on the Reeves drive,
don't forget to oil the brake cork.

-D