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Member postings for Rod Renshaw

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

Thread: Vice
22/10/2021 10:05:07

Never mind the width of the Atlantic, I find a difference in the length of my workshop!

At the metalwork end it's a clamp and at the woodwork end it's a cramp, and sometimes it's the exact same tool that I have borrowed from the other end.

Does this happen in places other than England ? ( I am not sure if the Scots and Welsh have this situation)


Thread: Help with a broken Sieg Super X3
21/10/2021 20:24:44

I have always found Arc to give very good customer service.

Not replying to an email does not sound like their usual standard. I wonder if the omission is anything to do with staffing problems due to Covid, or perhaps just a random thing. It might be worth trying them again.


Thread: Lathe query.
21/10/2021 17:37:48

Welcome Paul

All good advice above, but if you should be unfamiliar with working with it, please be aware that 415v will kill the unwary.

240v sometimes gives you a second chance but 415v is not forgiving

Apologies if you know all this.


Thread: From where I might be able to source some 1300 micron (1.3mm) mild steel sheet?
19/10/2021 20:23:18


Now that we know a little more about the application:-

Of the common materials, soft "steel" will be attracted most strongly ( High permeability), and the less carbon the better. Stainless steels are not so good, as you have said.

A harder steel (more carbon) will not be attracted quite so strongly but the difference may not be important. But a harder steel will probably have more remanence, ie it will tend to become a magnet itself under the influence of the permanent magnet, especially if there is movement between the 2. But you said this does not matter. The essence of a latch is that it opens and closes so perhaps the build up of residual magnetism will affect the operation in time.

So, very soft steel, or soft iron, alternative names for nearly pure iron. perhaps a lamination from an old transformer might be close enough in thickness. Your drawing does not make it clear why the thickness is so critical.

Obtaining such small amounts of such material of a particular size may not be easy and some adaptation to the design may make life easier.


Edited By Rod Renshaw on 19/10/2021 20:55:54

19/10/2021 18:04:50


I am not clear what you mean by "strongly magnetic."

Ferromagnetism (as I understand it) divides into:-

"Hard" - meaning it retains it's "magnetism" " permanently" - like a horseshoe magnet, sometimes called a permanent magnet.

and "Soft" - meaning it is attracted to a magnet but is not magnetic itself unless it is close to a permanent magnet - like soft iron which you could pick up with a horseshoe magnet but otherwise it just sits inertly on the bench.

Which you need is going to determine the suitable type of steel, and perhaps where you could get some from.


Thread: Hi Far from new/poorly bench top lathe
19/10/2021 11:58:11


I don't know, just what I was told. Perhaps the man who told me the original story got self- act feed and cross feed mixed up.


19/10/2021 11:37:26

Someone told me once the "M" stood for "Military" and was because of the type M lathes having power cross feed and a self- act trip - which made them especially suitable for use on destroyers etc. while they were bouncing around on the ocean blue. any truth in this story do you think?


18/10/2021 16:14:08


I had expected others to contribute to your question and to comment on the type of lathe you have. Drummond made lathes from about 1905 and many of their smaller types were used by model engineers. Solid reliable machines well worth restoring for their historical value as well as for use. Many were sold to the military for use on ships, submarines and army mobile field workshops. Some on this forum have and use the later Type M and I suspect there will be some who have or have used a type B and will be able to answer any specific questions you may have about this type.


Edited By Rod Renshaw on 18/10/2021 16:14:37

Thread: big jaws for my milling vise
18/10/2021 15:49:11

Hi Celso

Good solution to an awkward workpiece holding situation. I am afraid I could not follow the Spanish? soundtrack but the pictures are worth a thousand words. Keep up the good work.



Thread: Hi Far from new/poorly bench top lathe
18/10/2021 12:53:52

Welcome to the forum. Seems to be a Drummond "B" type lathe. See " " website.


Thread: Super 7 questions
18/10/2021 12:05:39

Re the oil cups for the countershaft bearings.

My 1970s vintage Super 7 handbook has a rather "For Industrial use" feel about it. It says, on the fold out page, "Replenish oil-cups daily" but on the following page, in the text, it says "The hardened steel countershaft runs in oil impregnated bronze bearings which are located in the swing head. Oil cups are provided for occasional lubrication."

I have tended to follow the later instruction, adding a few drops of nuto each time I came to use the lathe after a period of not using it, so rather like Martin's regime. I am still using the original shaft and bearings after 40 years so I don't worry too much about it.


Thread: Reproduction ivory look hand grips
14/10/2021 14:36:12

I can confirm the potato in vinegar story,. but like John I have not tried it.

I was told about it by a small girl who had read it in her Girl Guide Annual and told me "because you mess about with things in your shed"


Thread: Super 7 questions
14/10/2021 11:06:44

Reading through the posts it seems Myford may have changed the screws that secure the gearbox from !/4 " BSF to M6 at some point. OP might be best to check his machine.


13/10/2021 16:09:39

My Super 7 is about the same age as Tug's and all the holes indicated on your photo are 1/4" BSF on my lathe.


Thread: a little diversion
11/10/2021 19:43:15

Peter - I was reading the 32 nd poster responding to the original post on the Practical Machinist website, and to which I was signposted by David's suggestion to Michael. Are you saying there was a previous thread on this forum, if so I was not aware of it, I was just trying to keep this "diversion" moving.

Nick - thanks for the definitions. I was more or less quoting the 32 nd poster I referred to above, and who seemed quite precise and authoritative about his understanding that a revolution must be around a fixed point.

As someone has said there may be several answers depending on one's interpretation of the problem and the question. I can't imagine the original question setter could have imagined how much entertainment his/ her question would generate.


Thread: t-bar material advice
11/10/2021 19:38:00

+1 for Tim's idea, I have done this for some time and it works well.


Thread: Could you get away with this today
11/10/2021 18:02:47

I quite enjoyed quite a lot of this, especially the slap-stick aspects, and particularly the nurse learning karate and then using it to remove a patient's plaster cast. The scenes of lots of skimpily clad women running about seemed very dated though.


Thread: a little diversion
11/10/2021 17:46:52

This problem gets better or is it worse?

After scrolling down David's link following David's suggestion to Michael, I am beginning to think my earlier answer of 4 might be wrong.

Is there a difference between "Revolve" and "Rotate"? While it true that Circle A rotates 3 times in it's circuit around Circle B, are any of these "turns" actually revolutions? The poster posits that a revolution means going around something else, a fixed point, and by implication turning on one's own axis is not a revolution. I know we often use these words almost interchangeably, but we can be more precise.

The question asks "How may times does Circle A revolve?" Since the only fixed point we have in this line drawing is Circle B, and Circle A only goes around Circle B once, should the answer be !?

Any other answers?


11/10/2021 14:44:16

Wonderful puzzle.

I think I have convinced myself the answer is 4. Malcolm's diagram is very clear.

The original question asked was "How many times does the circle "A" revolve in total?

and NOT "How many times does the circle "A" rotate about circle "B"?

So, A rotates around its own centre 3 times, and A also rotates once around the centre of B. So, 3+1 =4.

I think the same argument also applies to the situation where A is inside B.

This is one of those situations where one has to concentrate on answering the question as asked. Can't see many at Westminster being able to cope with this.


Thread: SKY abandoning their satellite customers
11/10/2021 11:27:52

When Virgin installed cable along the road here they dug up the pavement and left a slightly lumpy tarmac surface, not too bad.

When a few years later we yielded to advertising for free installation and signed up, they laid our branch cable across the lawn by using a spade to make a narrow slit in the lawn and trod the turf back into place. It was hard to see the line of the cable at all after only a few days. They lifted and re-laid the flagstones of the path expertly and I was quite impressed with the installation.

Our Virgin TIVO box can record 6 programmes at once, though we rarely do so!


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