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Member postings for Dennis WA

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

Thread: Rabone machine level
28/04/2020 22:43:50

See also the 2017 thread by Andrew Tinsley

https://www.model-engineer.co.uk/forums/postings.asp?th=129638

Thread: Stuart 9 building tips
24/04/2020 17:45:48

Thanks Dave. Tubal Cain covered the build in 1975 (ME Vol 141) which became the book.

I now have a bound copy of Vol 141. It seems there were no other posts highlighting errors or construction tips.

Dennis

23/04/2020 10:22:11

I am about to start building a 9H. The complete set of castings etc came from a deceased estate and includes the pump and governor, plus drawings.

Searching Bill Phillips and Chris Orchard's ME index and this site has not turned up any construction notes or observations.

Are there any that I have missed?

Thanks

Dennis

Thread: Percival Marshall Speaks - Model Engineering Video
14/04/2020 14:14:26

DC31k writes above: There is another thread on here mentioning an article on Schlesinger limits by a South African guy which can no longer be found (I believe it was somewhat turned into an article for MEW). If this were also located again, it would be good to host it.

The article is : "No limits: George Schlesinger" by Alan Bester.

MEW No 246. Autumn 2016

Thread: Colchester Student Mk1 Won't Start
09/04/2020 10:07:02

Richard

I used a piece of coated steel approximately 150x80x1.6 mm that was to hand.

Dennis

08/04/2020 22:34:09

Duplicate post removed

Edited By Dennis WA on 08/04/2020 22:36:40

08/04/2020 22:32:34

Richard,

I am sure you have thought about this, but do not get paint on any surface of the gap bed that sits on, or is adjacent to, the main lathe bed. To preserve the accuracy of the machine when reinstalling the gap bed it must be clean and go in the exact same position.

My Student stands on a concrete floor with some shim under one corner to get it firm and level. I have no problems with accuracy of the finished product.

If you want to raise your student you could use heavy steel channel across each end. My Myford Super 7 ( which is on a factory steel cabinet with tray) is raised like this. I also have no problems with its accuracy.

I have a high precision level which helped to ensure the lathe beds were not twisted. I machined test bars to confirm the lathes cut the same dimension near the chuck and at the end of the bars near the tailstock.

Good to see you are able to use the Student.

Dennis

Thread: Help with Capstan Crankshaft Deflection Indicator
08/04/2020 15:11:02

Howard The grub screw provides an adjustable stop for the gear quadrant that meshes with the pinion on the shaft carrying the pointer.

Conclusion: There is no provision for zeroing the pointer with the dial.

I opened the movement after removing the bezel using a sharp blade. It needed a clean and I reset the pointer to rest at +20 and it now goes round to -25 without difficulty. More than enough range for me to check the deflection of crankshaft webs, which indicates a shaft running out of true.

Problem solved!

Dennis

08/04/2020 12:46:00

Thanks Howard

Slacking the grub screw was the first thing I tried. No effect. I could not unscrew it from the body either.

I will try and see if the bezel is seized on the body preventing rotation.

Dennis

08/04/2020 12:31:42

Bazyle

Thanks for the comments. I have watch and clock tools and repair experience. I cannot get the bezel off without resorting to force, which is not an option!

Dennis

08/04/2020 12:26:07

Thanks Ady

My problem is that I cannot rotate the dial. How does one do this so as to set the pointer where you want it?

There is a screw in the body, but I have not been able to work out what it does.

Dennis

img_2123.jpg

Thread: Colchester Student Mk1 Won't Start
08/04/2020 10:58:25

Richard...Phil has done a great job in helping you, including emphasing the safety aspects.

I agree with Dave that you have sorted it out as you have progressed and are learning as you go.

I have a 1964 Student Mk 1.5 and have followed the thread with great interest. At no stage could I add anything to what you had got from other folk.

Congratulations on your progress - enjoy using the Student and good luck with your studies.

Dennis

Thread: Help with Capstan Crankshaft Deflection Indicator
08/04/2020 10:32:32

Is it possible to turn the dial so that the reading covers the positive and negative movement equally? The picture below shows what I want. The picture with the yellow arrows shows what I have : an anti-clockwise movement from rest position at -18 to full deflection at -5.

img_1241.jpg

img_2122.jpg

Thanks

Dennis

Edited By Dennis WA on 08/04/2020 10:36:01

Thread: TTFN
19/07/2019 20:02:51

Andrew

I am really pleased that you are going to take a short break and then rejoin us!

All the best

Dennis

18/07/2019 15:30:34

Sadly your withdrawal harms the benefit that most of us derive from this forum. It only benefits those who believe they can ignore good manners when expressing their opinion. 

Edited By Dennis WA on 18/07/2019 15:32:42

Edited By Dennis WA on 18/07/2019 15:33:53

Thread: Digital display settings changed and not sure how to get it back!
28/04/2019 07:53:11

Contact Machine-DRO at:

  • Address : The Allendale Group Ltd, Machine DRO Dept, Pindar Road, Hoddesdon, Hertfordshire, EN11 0BZ, United Kingdom
  • Email: sales@machine-dro.co.uk
  • Tel: +44 (0)1992 455921

I have their product on my lathe and milling machine and have found them most helpful.

They advertise on this page - see the ads under Support Our Partners on the right hand side.

You can go directly to their webpage at www.machine-dro.co.uk

Thread: Myford S7 countershaft bush temperature
03/03/2019 18:56:44

Mike .....thank you for this useful feedback. My S7 is running very well on the low speed range with all bushes and bearings at room temperature. On the high speed range only the countershaft bush next to the clutch gets hot when running at the 2 highest speeds.

I am still going to fit new Oilite bushes and will post the outcome.

03/03/2019 18:56:42

Mike .....thank you for this useful feedback. My S7 is running very well on the low speed range with all bushes and bearings at room temperature. On the high speed range only the countershaft bush next to the clutch gets hot when running at the 2 highest speeds.

I am still going to fit new Oilite bushes and will post the outcome.

01/03/2019 20:13:21

Regarding heavier oils, Bromor make oil impregnated bronze bushes that require one to soak them in SAE 100 oil for 12 hours if you have machined the bush.

Bromor state that:

During manufacture the bar stock is vacuum impregnated with oil to a level of some 18 % (by volume).

The oil is supplied to the shaft through thousands of interconnected, oil-impregnated pores.

Due to capillary action present in the material, the shaft is wet with oil, whether in motion or not.

An immediate oil wedge is always present when the shaft is in motion, assuring proper lubrication at all times.

01/03/2019 14:50:13

Dave

Thanks for your explanation.

The bush fitted by Myford is an Oilite which is pre-loaded with oil and supposed to last for a long time (Myford ask that you keep the oil cup topped up as needed). My Oilite bush currently has 1 thou clearance from the hardened steel countershaft which is indeed highly polished. The bush is not highly polished, but the bearing surface is in reasonable condition. The 2 countershaft bearings and their associated ball thrust-bearing are going to be replaced.

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