Member postings for Trevor Drabble

CB,

Have got a number of these to sell. Will check prices on flea-bay. Would aim to be below these, and will then PM you.

Regards,

Trevor

Tony,

If you are still interested, I have 2 original copies of this book , each with a slighly different cover.

Trevor.

Peter,

For your information , in the very good Newton Tesla variable speed package I have on my lathe it states quite clearly that the motor must not be run for long periods below 800 rpm , obviously to avoid over-heating (as per Jasons comment above ) which is why I still use the change belts.

Also, not familiar with your machine , so would ask what types of protection are there on the machine in order to try and prevent the overheating , and since this would appear to be a regular problem , I wonder if someone does a mod whereby a thermal protection device may easily be fitted to the board ? I have in mind as a precident the improved American made circuit boards for the mini lathes.

Trevor

Derek,

You may find looking at the vertical steam pumps supplied by Southworth Engines ( 0114 281 8595) will be of use.

Hope this helps.

Trevor.

Alan,

Suggest you contact Nutool direct. They are (were ) in Doncaster at DN6 7DU and are (were) on 01302 721791. Last time I contacted them some time ago they were very helpful.

Hope this helps.

Trevor

Ian,

Have you tried actually talking to Parvalux ? When I had a similar problem a few years ago , I found them extremely helpful.

Trevor.

John,

Since you have limited facilities, you may find my Classified advert of 05/05/2013 on these pages of potential interest. It is an old design for a 6cc single cylinder vertical spark ignition engine , especially so since it also includes the construction book.

Trevor.

Conrad,

I am in Barnsley and prepared to offer any help required.

Trevor.

Notlob,

I faced exactly the same problem as yourself with my ER32 holder, but since one of the reasons I chose my Myford VMB milling machine was because of the 3000 RPM top speed, the solution was relatively simple. I modified an R8 stub arbour to accept a grinding wheel I had in stock , then set up the collet holder vertically onto an angle plate on the milling macine table, protected all exposed machined surfaces, installed a front safety guard for myself, and then, ensuring I was below the MOS, ground a pair of flats on the holder body to suit a Clarkson collet chuck spanner I had in stock.. One thing I did particularly ensure was that I only presented the holder to the wheel AGAINST the direction of rotation since I did not want it to grab.

Hope you will find this info of some use.

Trevor.

Chris, A little more information for you.Cromwell Tools are listing a Lumatic 31650 grease/oil gun, Part No CTL 5404526B, for £15.59 incl VAT.

Looks as though the loading of the pictures has worked.

My Dobbie McInnes indicator has a 1.064" dia x 16TPI male thread on the bottom of the body, which I believe may be a Pg 21 conduit thread. Included in the set is a separate threaded removable collar for fitting the body to the engine. This collar has a matching internal thread to the body for half its length, whilst the other half is threaded to accept a 1.171" dia x 10 TPI whitworth form thread.

Hope this helps.

Trevor.

The skeleton rower was Harrogate 2010. Have got a couple of pictures of it, but am having trouble uploading the first one. As and when it works I'll post them.

Trevor

Robert,

You may find the thread "Myford Super 7 Single or Three Phase" dated 25/03/2013 of use in helping with your questions.

Trevor

Scott, Appreciate I may have got the wrong end of the stick here, but my understanding is that you need to generate some long flat and parallel faces here. How feasable is it therefore to use a sharp tool in a very substantial bar mounted similar to say a boring bar, but with the chuck prevented from rotating. The offending milling slide is then mounted securely on the cross slide, with small cuts being applied to one face at a time as the saddle is wound back and forth, so in effect using the lathe as an old fashioned hand planer. In this way length of cut will not be a problem and , assuming the lathe is already set up correctly, the results should be reasonable enough for your purposes. Trevor.

Paul, I have a S7B which was purchased as a factory recon direct from Myford and it came with new electrics, including a Brook Crompton motor.Similarly, I also purchased a new VMB with VFD already fitted ( Danfoss VFD and Brook Crompton motor) Attracted by the advantages of VFD, I too was impressed by the excellent NT service and package, and subsequently effected the change to the S7B. Overall I am pleased with the conversion, but there are some points of note. In my experience, the NT motor is not as smooth running nor as quiet as either of the BC motors, though it is still acceptable. Adequete ventilation can be a problem with all motors, and this is one reason why NT recommend a minimum motor speed of 800 rpm. Continued use below this speed may result in the heat of the motor exceeding the insulation class of the windings, and thus causing damage. You also need to understand that with VFD there are very real differences at different motor speeds between the power a motor developes and the torque it delivers. Again NT were very helpful in this aspect. In addition, since an electronic VFD can only generally deliver the voltage it is supplied with, NT accomodate this by supplying the motor specialy wound for 220 V. You may find that other companies supply 415V or similar standard motors and this therefore may be one of the ways they are able offer lower prices. In addtion, the NT package came with a 10 year guarantee on the Mitsubishi inverter, but am unsure if this is still the case.

Regarding your question regarding differing power requirements this is actualy related to the different torque characteristics of single and three phase motors.

So, to summarise, in my opinion, whilst VFD is not a panacea, if used properly and in accordance with its properties, which includes the occassional belt change to exploit them, then it is undoubtedly worth the investment.

I hope you find the above of some constructive use. Also, I have no connection with NT in any way other than as a very satisfied customer.

Trevor.

Grizzly,

Have sent you a PM.

Many Thanks.

James, For my part I have used a Trend T30AF extractor for a number of years and which I have found most satisfactory for all such jobs, including wet ones. Not cheap , but then it is all good quality and comes with a 3 year guarantee, large accessory range and readily available spares. I get replacement filter bags locally from Alltools or Cromwell. Never changed the pre-filter, just keep washing it occassionally .D & M Tools have a video of it on their web site. Hope this helps.

Trevor.

Gents , May I suggest you will find much of the information you require in a convenient form on a small (4" dia) double sided plastic disc with a rotating arm available from Monument Tools www.monumenthandtools.co.uk Part No (MON530J) for £4.25. I have no affiliation with the company other than a satisfied customer.

Sorry, missed that one. Then how about a blank end arbor from Arc and simply machine the taper you want onto the soft blank end ?

Trevor.