new Harrison L6 mk3

James,

I know it's not much, but; I can't see how you could possibly need a 30° tool for an ACME thread.

ACME has an included angle of 29°

... Trapezoidal threads are available [and increasingly common], but these are not ACME.

MichaelG.

James ... it's worth a look at **LINK** to appreciate the difference.

https://en.m.wikipedia.org/wiki/Trapezoidal_thread_forms

MichaelG.

Abso ###### lutely

.

P.S. ... useful video here:

https://m.youtube.com/watch?v=pn8ehbquSrY

Edited By Michael Gilligan on 21/01/2017 21:24:00

Hi,

I've recently acquired a Harrison 155 lathe. I've been running a Myford ML7 for a number of years so I have some lathe experience but this is a new unit and I have a few questions!

Hopefully anyone running a 12", 165 or MK2-3 etc. might be able to assist. I've just spent 40 hours cleaning it. That's a LOT of really dirty work. It's wired and works just fine i.e. I've just turned it on and the chuck spins and the motor sound good etc. Well, in actual fact the motor runs backward which I'm pretty sure means I haven't quite got the 3 phase connections right but we can get to that later.

First off - lubrication. I've done an oil change on the headstock, 2.5 litres brought the visual oil level indicator perfect. I've used my Wanner oil gun to oil all nipples (24 oil nipples I think I counted, including the 2 on the clutch arm). Plus grease the 2 nipples on the motor. That's a load of nipples!

Next - gearbox - the oil sight level indicator is very difficult to see properly, I couldn't actually tell where the oil level was. So I removed what I believe to be the drain plug under the gearbox and nothing came out. I assume there's no oil there. When looking down the filler hole I can see some gears but no oil. But that's not at the base of the gearbox anyway. I put 400ml of oil into the filler hole but now I am getting oil (quite a puddle) coming out the side of the feedscrew area. Does anyone know what the oil capacity of the gearbox is? The sight level indicator is very near the bottom of the gearbox so I would again assume that there is very little oil actually used in the gearbox. Also is the small plug under the gearbox the drain plug. If there was already oil in there how come it didn't drain out when I removed the plug.

I do have a manual - for the MK2-3 - but it's not very good on those sort of things. I've read the manual many times now.

Next - the carriage has the pump oiler on it. When I pump it - nothing happens. So I put some oil in the filler hole on the Apron and it immediately drained out the bottom. At least I have identified the drain point. I can't quite see how it should be plugged, is there a hex screw that is supposed to fit in? Also once I solve that does anyone know the capacity of the oil pump chamber. I guess I just fill until completely full.

That's it for now, the next batch of questions is about 'those darn selector levers with a ball bearing that just doesn't want to move out of its recess in the body of the lathe' and 'why can't I get either the feedscrew or feed rod to do anything'. And I should probably address the running in reverse issue while I'm at it!

Many thanks

Phil