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Member postings for Kevan Shaw

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

Thread: Steam pump
26/10/2020 19:54:26

37757c3b-1170-4bc6-8789-963fd1bbe35c.jpegI just found this design for a small steam pump in 5 january 1973 Model Engineer. I would value some advice as to how viable this design is for an inexperienced model engineer like me and whether I could use aluminium for the cylinders and steam chests with brass pistons and valves.

thanks Kevan

Thread: Virtual Meet Ups
17/10/2020 12:29:33

Please add me to the list as well

Thread: Anyone recognise these.
24/09/2020 18:45:36

They all look pretty boring to me

the one in your hand looks like it has a broken insert. They could be used in a boring head in a mill or in a lathe.

Thread: Dore Westbury milling machine
16/09/2020 21:20:46

Hi, I am looking for a small mill and have seen a few of these turn up at reasonable prices. As mostly amateur built I am rather hoping that the ones that have survived in use are likely to be of reasonably good construction as bad ones would have been scrapped by now!

What are these like as mills for model engineering? What are the capabilities and shortcomings? Should I consider one of these or are there better small cheap milling machines to consider?

thanks for your comments

Thread: Myford super7 motor U/S
16/09/2020 07:45:30

I would definitely replace the mounts with something resilient otherwise you will transfer a lot of vibration to the machine along with more noise. Resilient mounts are very common so can be got from a variety of sources. Modt likely local source is a friendly car parts supplier as they are used all over modern cars. Take one of the failed ones along and see if the can find something that looks and feels the same. Exhaust system mounts are a good place to start looking. Otherwise if you have a good local engineering supplies place they should be able to help.

having said that my motor is just bolted straight to the motor mount plate and runs quite smoothly. I haven’t noticed if the hinge between the motor mount plate and the lathe bed has any resilience.

13/09/2020 09:55:08

I had to add another post to make enough connection points for the Dewhurst

9f44f932-4175-4953-b2e8-5563cfde430d.jpeg

Edited By Kevan Shaw on 13/09/2020 09:57:38

Edited By Kevan Shaw on 13/09/2020 10:01:53

13/09/2020 09:55:08

Here is a connection diagram I found and used to sort my lathe out

cf988bcd-b2fa-40be-a234-17e8b6808c11.jpeg
the connection labels might not be the same as your motor. By the way what make is your motor? Mine is an SEM and this is the connection box as it was when I started.

230aa4be-7246-4a9e-bd22-b9293fdfa825.jpeg

Thread: Myford motor wiring problems
10/09/2020 18:03:54

Emgee,

yes I have a red and black going to the capacitor. Feed comes from the Dewhurst switch on Z2 into the capacitor the output from the capacitor goes into the centrifugal switch the output from that connects to one end of the starter winding at the new connection post I added. Other end is on Z1 that connects back to the Dewhurst.

neither set of winding wires show any polarity the starter windings being black and running windings being red. Should I change polarity of both sets to get correct direction of running? It seems to be happy at the moment?

10/09/2020 12:50:06

It works

As suspected the wires were not all on the correct posts and in effect there was a connection post missing to pick up the connection from the start switch and the start winding. Once that was solved it ran, but backwards. Swapping the feeds to the run coil fixed that so now it is all working as it should I think!

If anyone else has aSEM motor the pair of blacks are the start coil and pair of reds are the run coil, the pair of greens are the start switch and the red and black are quite obviously the capacitor.

Thanks for the help and moral support😃

08/09/2020 22:01:13

That is the idea, how do you tell difference between start and run windings?

Thread: Myford super7 motor U/S
08/09/2020 21:18:50

First guess would be failed start capacitor, that is if there is not an obvious duff connection. What kind of switch do you have?

Thread: Myford motor wiring problems
08/09/2020 20:57:01

My Myford came with a switch feeding its SEM .75hp motor. I recently bought a Dewhurst switch to replace the very tired MEM switch fuse. I followed the wiring diagram for a capacitor start motor and was treated to a big flash and blown circuit breaker. I reasoned that there must be a short. As I couldn’t see anything i lifted the connection board to find a shorting link between A2 and Z2. I removed this but same happened.

I am coming to the conclusion that the motor wiring may not be connected as it should be to the terminals. There are 6 wires coming up from the motor 2 each red black and green how do I figure out which is connected to which winding so I can check what is connected to which terminal?

Otherwise any ideas how I can get this correctly wired?

Thread: Myford ML7 mainshaft
03/07/2020 00:21:33

Hi,

my ML7 has developed a problem. There is slipping between the 3 way pulley and the gear it is supposed to be fixed to. When I see pictures of this part there is often a grub screw visible in the valley of the middle pulley however there is not one on mine.

is this a regular problem and what is best solution? I think the pulley assembly is retained on the shaft by a press fitted collar how can I get that off without damage given I don’t have a press? If it is a hammer job how can I support the pulley assembly so it doesn’t get damaged. The pulleys look like aluminium so I am worried that they may get damaged if I am clobbering the shaft hard enough to budge a steel collar on a steel shaft .

thanks for help with this!

kevan

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