[modeleng] Re: Progress on little lathe

Full steam ahead eh Hubert? I'm quite looking forward to seeing some pics

Shep wrote:
> Hello everyone
> I have progressed with the construction of my little lathe.
>
> I am feeling quite chuffed.   I have made the tumbler gear for my leadscrew, 
> placed on the right-hand side of the supporting 'wall'.   This gives me 
> forward, neutral and reverse, and above all, allows a stub 'leadscrew' to be 
> placed about 2" lower than the actual leadscrew, thus making space for a 
> normal Myford 'banjo' and Myford change wheels (of which I have a large 
> selection).    I cut the leadscrew to 10 tpi Acme thread.   10tpi = 2.54mm, 
> which I considered to be near enough to 2.5mm.    I have tried my first 
> metric screwcutting - a .5mm thread, and I am delighted that there is no 
> detectable error.    This avoids the necessity of a conversion change-wheel.
>
> On the right-hand side of the leadscrew, I have installed a poly-vee pulley 
> system, driven by a car wiper motor and controlled by a power source. giving 
> variable speed.     When the tumbler gear is in 'neutral', I can use this for 
> 'sliding' the saddle.    I have got it down to 4 rpm, thus enabling me to cut 
> a very fine finish.
>
> The mandrel is driven from a 3-phase motor, via a poly-vee belt, controlled 
> by an inverter.    When cutting heavier threads, the slow speeds do not have 
> enough torque.   I have mocked up a 'back-gear' system, using some gears I 
> happened to have lying around.      This gives an 8.7-1 speed reduction.     
> My little lathe design did not include back-gear, partly because of the 
> restraints of space and mainly because I did not wish to want to have gears 
> driving the mandrel and affecting the turning finish.      I will place this 
> free-standing reduction gear behind the lathe, and drive the mandrel by a 
> poly-vee belt.
>
> Once all of this is finished and working, I will send you a series of 
> pictures, which will show the system.
>
> Glad to see an upsurge in messages - always so welcome!.
>
> Cheers!   Hubert
>
>
>
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