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Member postings for Neil Lawton

Here is a list of all the postings Neil Lawton has made in our forums. Click on a thread name to jump to the thread.

Thread: Soba rotary table
14/03/2019 17:10:49

Many good points raised, thanks.
The Soba table I have has the spindle mounted using a needle roller bearing rather than a slide fit. It doesn't feel particularly tight so I don't know how this will cope with machining stresses.

Apart from the issue of accuracy, I would think the lateral movement of the table would allow more of the machining forces to be felt by the worm and gear wheel possibly causing premature failure. I don't know if the Vertex has the same amount of movement, though one of the YouTube videos shows the owner trying to improve the slide fit of his Vertex.

I managed to remove some of the worm gear wheel offset by remounting it. Having to account for variable backlash that was dependent on the angle of rotation was going to be a task beyond my little grey cells.

Since the intended use is just for hobby purposes rather than high precision the advice that I should just get on and use it sounds about right.

I think the main thing to take away is that rotary tables at this price point are not going to take any abuse and need to be used carefully ... just how carefully only time will tell.

The seller has kindly offered a return of goods if I am not happy but the hassle of returning it plus the risk of getting a similar one back makes me reluctant to do that. If it breaks or is unuseable for what I want then lesson learnt and move on. However I would have been prepared to spend more money on a more robust table given what I know now. But is it possible to guarantee that paying more will actually get better quality, especially if suppliers are getting stuff from the same pool of manufacturers. Who is doing the checking that the quality is good and consistent: manufacturer/supplier/seller/user. It all feels a bit hit and miss.

09/03/2019 11:40:20

I recently received a Soba HV6 rotary table and found the following:
(i) With the worm gear disengaged, I can push/pull the table laterally (orthogonal to the axis of rotation) by about .05mm. Tightening the axial preload collar on the base of the unit has no effect on this 'slop'.
(ii) The worm ring gear appears to be slightly offset from the axis because cranking the handwheel stiffens for one half of the rotation and loosens for the other half. This means that I can set backlash to 2' on the tight half but it goes out to 8' on the loose half.

This is my first rotary table so I have nothing to compare it with. Would the group consider this acceptable or is it enough to return.

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