Hardinge HLV

[Tony Pratt 1Participant @tonypratt1]

Posted by Pete Rimmer on 05/08/2022 11:24:25:

You can't put 3/4" up the hole on a ML7 but you could hold one end in a 3- or 4-jaw and run the other in a fixed steady. It would turn on it's own axis then with no need for clocking in. The two diameters would be completely concentric.

Slightly simplistic, you would be well advised to clock the length of the bar to make sure it is sitting parallel to the lathes axis both fore/aft and up/down. If either are significantly out the bar will tend to work it's way out of the chuck.

Tony

[JasonBModerator @jasonb]

Or set the fixed steady onto the work at the chuck end and just slide it along the bed. Should be concentric then (subject to bed wear)

[Mark RandParticipant @markrand96270]

Another thought to confuse the issue.

if you could find a firm with a way grinder, then grinding the bed plates of the HLV is a fairly trivial operation (three faces on two pieces, as opposed to seven faces on one piece for a Myford). The bed can then be shimmed up by the same amount that was taken off the top and everything else will line up when put back on, apart from the leadscrew, which can cope with the misalignment. I know this, because that's what I did with mine. The carriage's taper gib can be shimmed or re-made. After that, even with a worn cross and topslide and feedscrews, the HLV will have the 1 1/4" bore and will run rings around a Myford even if just used as a plain lathe. other repairs, upgrades and maintenance could be done as time and profits allow.

Edited By Mark Rand on 05/08/2022 17:37:03

[James Jenkins 1Participant @jamesjenkins1]

There is a lot of sense in what you say Mark, but having looked a little closer at my exisiting Myford I have decided to stick and work with this one to get it up to a good standard – rather than perhaps jumping out of the frying pan and into the fire.

Initially I was thinking about having the bed reground, but when I took readings of the thickness of the back bed rail (every two inches) I found that there was only 9 tenths wear, which seems a good place to start and I'm not sure that re grinding is the priority. I need to check the wear between front and back bed rails and I am awaiting delivery of a tenths DTI to enable me to do so, but I think it might be around 1.3 – 1.6 thou (I was very quickly using a .01mm DTI).

I also looked again at the tailstock and with the barrel wound in I was getting less than 1/2 thou movement, with me pushing pretty hard. Of course with the barrel out this increased – I need to go through and make proper records.

There is however movement in the head stock bearing, as I knew. Likewise the morser taper 1 socket is poor, with the taper pinching and allowing movement.

So I think these two things will be my focus for the moment – get these two right and then see how we go from there.

Kind regards,

James

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