|Johan Crous||26/12/2012 19:48:49|
38 forum posts
I have a Quantum 210 x 400 mm Metric Lathe with a 2.0 mm leadscrew. This lathe is very similar than the Warco 180 lathe.
23022 forum posts
I would be wary of adding an idler gear to the handwheel as the backlash in the gears will be counter productive to what you are trying to achieve. Also have you measured how much backlash there is in the half nuts before you start.
Also having previously had an Emco for 20years that had a handwheel on the end of the leadscrew I seldom used it and hardly ever for turning.
|Clive Foster||26/12/2012 22:50:38|
|3172 forum posts|
I never found the reversed motion of a directly fitted lead-screw hand wheel any great problem. One tends to adapt quite easily. I'd agree with Jason that such handles are rarely used for turning. Once I got a graduated ring fitted mine was mostly used to help set up rods on a 6 position turret type bed stop. Very handy when a job had steps of various diameters. In my view a multi-position bedstop is an essential accessory.
A calibrated leadscrew handle is, of course, pretty much essential if you wish to get much use out of a vertical milling attachment.
|Johan Crous||27/12/2012 14:58:15|
38 forum posts
There is now backlash on the halfnut but on the saddle wheel that is connected to the rack, the play is noticeable, about 10 degrees of a turn of the wheel and relates to about 0.1 mm.
|John Stevenson||27/12/2012 15:07:44|
5068 forum posts
That's very good.
Saddle handwheels were never designed to be backlash free, I can't recall one lathe, even high end lathes that have any method of adjustment.
If you need to work both ways you just go further to take the backlash out and return.
150 forum posts
The Peatol\Taig has it's handwheel in an eccentric bush so you can set the engagement between the pinion and the rack. Works rather well once you get it set up properly.
|Engine Builder||27/12/2012 18:05:21|
253 forum posts
My Myford ML10 has the handle on the leadscrew, use it all the time, no problems.
|Stub Mandrel||27/12/2012 21:25:05|
4315 forum posts
I fitted the leadscrew mod to my mini lathe - I added a short spigot to the end and fitted a 'spare' saddle/tailstock handwheel.
It works much better than the saddle handwheel, and I use it when I want to remove bulk material by facing, only using the topslide tobring the durfae dead to size. I graduated it with 64 divisions so each one is 1/1024 of an inch.
With a metric leadscrew I could have used 80 divisions* and had each division as 1/1016 of an inch.
*I'm assuming a mini lathe leadscrew is 2mm pitch. Can someone confirm if it is 2mm or 1,5mm?
Edited By Stub Mandrel on 27/12/2012 21:26:05
|392 forum posts|
Metric Sieg and Real Bull "7x" minilathes have 1.5mm pitch leadscrews, Neil. That's fairly close to your imperial version's 16tpi. I guss yours is a Sieg, or you wouln't have needed that spigot. On a Real Bull, there's already a threaded extension for an endfloat adjusting nut, which can be used as part of the handwheel arrangements.
|Stub Mandrel||28/12/2012 18:57:29|
4315 forum posts
Thanks Andy, that would mean 60 divisions then.
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