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Member postings for Martin W

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

Thread: Chatter
24/09/2020 01:17:32

The tool post looks to have chamfered edges which could explain the apparent gap between it and the cross slide. Looking at the reflection of the tool post on the cross slide in the enlarged picture it appears there are chamfered edges on the bottom of the tool post which could explain the gap but worth checking anyway.

Martin

Thread: Mystery parts
21/09/2020 10:57:33

It's odd in that it appears to have 2 sets of valve gear the one on top of the cylinder is disconnected. Might have been an improvement with the intent to give it a reversing valve gear.

Martin

Thread: HSS/Tungsten Tool Honing Machine
15/09/2020 17:34:05

That's an elegant design and the workmanship is brilliant. It's one of those pieces of equipment that 'looks right cause it is right'. Mightily envious of the quality of work that you have achieved.

Martin

Edited By Martin W on 15/09/2020 17:34:35

Thread: Surfaces of Platonic Solids
08/09/2020 12:02:45

Thanks for that Michael, thoroughly enjoyed watching it. You wonder why nobody has asked the question before even if they didn't have the wherewithal to solve it.

Cheers

Martin

Thread: Mystery post
02/09/2020 18:05:57

How about a timer for street lighting that had to be set or wound periodically prior to the days of light sensors and remote signal control. I look forward to finding out what it is, it's purpose and age. The fact that a nondescript tatty old piece of street furniture has caused so much interest must be a reflection of the members of this forum's curiosity.

Thread: Miracles do happen
29/08/2020 14:02:34

Several years ago dropped a smallish spanner in my shed and before I could bend down to retrieve it the Gremlins pounced and snaffled it, I still haven't found what they did with it and I reckon they are still chuckling about it. As for small fixings/parts etc. they must have secreted a hoard somewhere! Ahh the joys of fumbling fingers, poorer eyesight and not being able to hear when small things hit the floor seem to be the gifts we acquire as we get older/old.

Martin

Thread: Help needed in identifying inserts
28/08/2020 19:30:41

Jon

I have not seen the like of these either. However they look to have similar dimensions to the TCMT1102nn series of inserts. If it would help I could send you a sample insert that is designed for aluminium, tip definition - Aluminum Carbide Insert TCGT110204-AK--, to see if it would fit the insert bit bar that you have. While these inserts are designed for aluminium they will work on free cutting steels provided that one isn't too enthusiastic with the depth of cut or feed rate.

If your interested then contact me via the PM system on this site and I will get one in the post.

Cheers

Martin

Thread: Mini lathe blown fuses and Motor overheating
28/08/2020 00:25:55

Yes it is the last fuse that the energy supplier is responsible for but it is, as I said, the 1st fuse 'in the supply chain in the property' wink 2.

Cheers

Martin

27/08/2020 19:25:58

Martin

That is just the first fuse in the supply chain in the property which is then normally broken down into lower current circuits but it is the final safeguard. Yes I totally agree that it is sealed, is the responsibility of the energy provider and is there to protect the incoming supply.

As I had stated that I was looking at Fast Blow fuses I purposely did not include the Consumer Unit or any other fuse in the circuit and was giving just a general description as to the rationale re the fusing system and their purpose.

Cheers

Martin

27/08/2020 18:14:35

There seems to be a misunderstanding regarding the performance of cartridge/wire fuses and their rupture time. A quick blow fuse will run indefinitely at its rated amperage, which one would expect. However when the current rises above the rated value the fuse it does not immediately rupture. In fact, worst case figures, at 2 times the rated current it can take a fuse in excess 6 seconds to rupture and at 3 times the rated current it can take 0.4 seconds. The energy passed during this time is frequently enough to damage a semiconductor component.

Fuses are not there to protect the components or equipment but to limit the energy drawn by the device in order to:

a) To limit the current drawn so it does not damage the house wiring and potentially start a fire.

b) But primarily to ensure that the energy provider's cabling is not compromised.

Hope this helps.

Martin

Thread: Horological Tool Sale
11/07/2020 12:17:05

Hi

I have just been browsing a sale catalogue and noticed that they have sets of horological tools and lathes for sale. I have absolutely no experience in horology so no idea of the quality but the estimate prices look very low. For those interested, even just out of curiosity, the lots on offer can be seen here. Usual disclaimers re vested interests etc.

Martin

Thread: Nozzle Bores
02/07/2020 11:07:57

I have no knowledge of 3D printers or printing so I could well be talking gibberish, apologies in advance. Could it be that the nozzle diameter is designed with an apparently undersize nozzle/aperture to accommodate spreading of the the hot extruded plastic so that it actually lays down a track that is 0.4mm wide and the size given for the nozzle refers to the minimum wall/ track thickness that can be printed and not the actual aperture of the nozzle.

Hope this makes sense.

Martin

Edited By Martin W on 02/07/2020 11:09:47

Thread: Stroboscopic effect
29/06/2020 00:46:53

I believe it is illegal to fit LED bulbs into a road vehicle that has main and/or dip lamps that were originally designed for for the tungsten halogen style of light. It is probably related to the fact that the LED structure does not have the same/similar physical location and that this then distorts the beam pattern which could be a hazard to oncoming vehicles especially in inclement weather.

Martin

PS

Here is an article that partially covers the law.

(Edit to add above info)

Edited By Martin W on 29/06/2020 00:55:19

Thread: What fuses Warco lathe and Chester mill
24/06/2020 19:52:06

Andy

I can confirm Nigel's post that the WM14 manual states that it is 8A. However I would be very surprised if this is a slow blow fuse as they require a significant current surge before they rupture, I would expect that it should be a fast blow fuse so that the semiconductors in the speed control unit suffer the minimum stress before the fuse ruptures. That said I will check what is fitted to my mill as it is still the original fuse that the machine came with to confirm or otherwise which it is.

Martin

Thread: Hylomar universal blue failed to seal oil?
24/06/2020 11:33:53

A quick and dirty way that may fix the leak is to fit either a copper or fibre washer under the head of the bolt having coated all parts with Hylomar and assemble while still wet. If this doesn't work clean up parts and try assembly dry. The advantage is that you already have the Hylomar and if neither option works all you have lost is the cost of a small washer.

Martin

24/06/2020 11:15:27

EDIT TO MY PREVIOUS POST

I assume that the 2BA thread you are referring to is the cap head bolt at the bottom left in your picture. If so then I would expect this to screw into a blind hole in the case of the gearbox. If this assumption is correct the threaded part of the cap head would not be exposed to any oil in the gearbox. If so then the leak past this cap head might well be due to a failure of the gasket between the flat face of the gearbox and the cover allowing oil to seep through to the unthreaded shank of the 2BA screw and show up as a leak around this cap head bolt. It is relatively simple to confirm if the tapped section is blind or open to the inside of the gearbox. Remove the cap head bolt the fill the gearbox with oil, if it runs out then the threaded section is not blind, if no oil appears then leave it for a few hours or longer and check again and if no oil leaks then it is a fair chance that it is a blind hole.

The Hylomar data sheet states, and I quote: "Hylomar Universal Blue can be used to seal joint faces or threaded parts." While the data sheet specifies surface smoothness limitations for the three grades it does not give any gap filling limitations for threaded parts.

Hope this is of some use to you.

Martin

PS

If the threaded portion of the hole is blind then wrapping the threaded sect with PTFE will not be effective.

Edited By Martin W on 24/06/2020 10:38:45

Should have included the sentence highlighted in italics.

OOPS Bad day at the office

24/06/2020 10:30:51

I assume that the 2BA thread you are referring to is the cap head bolt at the bottom left in your picture. If this assumption is correct the threaded part of the cap head would not be exposed to any oil in the gearbox. If so then the leak past this cap head might well be due to a failure of the gasket between the flat face of the gearbox and the cover allowing oil to seep through to the unthreaded shank of the 2BA screw and show up as a leak around this cap head bolt. It is relatively simple to confirm if the tapped section is blind or open to the inside of the gearbox. Remove the cap head bolt the fill the gearbox with oil, if it runs out then the threaded section is not blind, if no oil appears then leave it for a few hours or longer and check again and if no oil leaks then it is a fair chance that it is a blind hole.

The Hylomar data sheet states, and I quote: "Hylomar Universal Blue can be used to seal joint faces or threaded parts." While the data sheet specifies surface smoothness limitations for the three grades it does not give any gap filling limitations for threaded parts.

Hope this is of some use to you.

Martin

PS

If the threaded portion of the hole is blind then wrapping the threaded sect with PTFE will not be effective.

Edited By Martin W on 24/06/2020 10:38:45

24/06/2020 00:39:33

If it is still of interest the data sheet/instructions for the 3 grades of Hylomar Universal Blue can be found here.

Martin

Thread: Change to the Code of Conduct
23/06/2020 13:56:41

While strictly not on topic but in relation to shipping costs from China to the UK are NOT free though they are extremely cheap. This site gives details of the cost of postage from China, at present the exchange rate is about 10CNY to £1 or about 10p to 1CNY. The cost to post a parcel to the UK is 5CNY for the first 50g + 0.09CNY for every gram extra even for air mail.

Martin

Thread: Weeds in a 'lawn'
21/06/2020 12:34:32

We have an area of lawn that is shaded and the moss was always present and no matter what we did with regard to scarifying etc. it always returned and swamped what grass was growing there. We read a recommendation for a product called Mo Bacter by Viano and this has been totally successful at removing and preventing the regrowth of the moss, usual disclaimers.

While it will not help with the weeds it will get rid of the moss and is a lawn fertiliser which will help the grass re-establish where the moss was, details can be seen here.

Cheers

Martin

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