Member postings for Ian P

Siddley

What an odd way of looking at life you must have, do you really think that model engineers are eccentric?

Ian

The difference between amateurs and professionals is that the latter get paid, (often for inferior work)

Wow! is the tap wrench for that called a Tango?

It takes two!

Ian

Edited By Ian Phillips on 26/11/2012 10:27:42

Oops! I apologise.

I must take care to read the whole post in future instead of just focussing on the technicalities.

I would offer to do the machining but I am in Cheshire sp probably too far, and I dont get down the M1 much these days.

Ian

Stuart

No disrespect, but rather than say where you don't visit wouldn't it make more sense to say where you are or at least give us a clue!

I doubt anyone here would want to steal your identity, but you don't have to put much detail into a profile and it would dramatically improve your chances of getting local help.

Ian

Neil

Why dont you ask the supplier what steel it was laser cut from?

I am surprised that the steel is so tough, but thats going on my experience of laser cutting. I have sometimes found that where the cuts starts of finishes there is a slightly hard spot and it pays to take a proper cut rather than letting the cutter rub.

The steel the people I use is A43 grade, (I am not sure of the full number but it includes '43'

Ian

DDazz

I am not a resident of Bristol but visit occasionally, Where do I find the 'feeder'?

Ian

Neil

Considering how much has been said on the subject I think your suggestion is mildly provocative! as the 'adverts over text problem' is not just confined to IE.

ian

Bob

I feel very mildly admonished, but cleverer all the same! (since I have looked it up, after I had posted)

Ian P

Bob D

I am not trying to be pedantic but your original post did not say the capstan was doing the pulling. What you actually said was,

'Posted on 16/11/2012 14:14:27:'

I need a coating to go on a capstan wheel to increase the friction drive on a 0.004" steel wire being pulled through it.

I have just re-read the original question but instead of editing my previous post had added another.

The OP states he want to 'increase friction on the wire that is being pulled through'.

I can deduce several meanings to that but my first suggestion would be to reduce the friction or torque needed to turn the capstan!

If the capstan is driving a measuring device, (or in fact whatever load), it is turning, it seems to me that it must to be too high for a very thin wire.

Basically we need more input from the OP.

Ian

Jason

As is frequently the case on this forum, several contributors suggest ideas often without many details so often a lot of speculation about the intended purpose leads contributors down blind or irrelevant alleys. Many times a thread meanders on without the OP adding any further details (does not apply to this one) based on what 'picture' is in the head of each contributor.

My take on the original questions was that it was some sort of wire driven encoder drum, or feed mechanism for a (long forgotten) wire recorder.

My reference to pulley diameter was not because it would make a difference to the friction, but that it change the effective diameter or calibration.

Only the OP knows the facts and since we do not know all of them our suggestions can only be regarded as guesswork.

To me there is no point in ideas like suggesting coated wire (yet) as the OP might be trying to make something that has to work with the raw material he already has.

I think of several 'slip free' methods of ensuring the wire stays in contact with the drum but I do not know if they are a solution to the OPs problem. A lot depends on which is driving and which is driven.

Ian

Or the Abrafile!

I used to cut steel and aluminium regularly, mostly 16SWG, with a jigsaw. Its noisy though.

I tried various lubricants and found the best of the lot is hardboard! When cutting metal normally with a jigsaw the fine swarf gets hammered into the material by the jigsaw soleplate, using oil it retains the swarf as it stops being blown away and it ends up damaging the finished (sometimes painted) surface of the job.

A sandwiched a piece of 3mm hardboard (or thin ply) between the say and the surface stops most of the marking, the best bit though is that the sawdust acts like a lubricant. It is especially good on aluminium, the blade teeth just do not clog.

Some jigsaws are designed to be cater for being clamped upside down in the bench vice which is better for cutting precisely to a line.

Ian

I have had numerous parts laser cut in stainless and MS. The MS was '43A' grade.

Not particularly by choice its just their standard material, I think I have heard that it made specifically for laser cutting, it bends and welds well, machines on the lathe to a beautiful finish, it looks like Chrome plated!

Probably not high tensile though.

Ian

Edited By Ian Phillips on 17/11/2012 20:21:54

Edited By Ian Phillips on 17/11/2012 20:22:35

Andy

My mention of overheating was just precautionary really, 'too long' is several hours.

I left mine on overnight and the workshop did take on a new aroma but no damage was done.

A series resistor would limit the current but then there is the problem of where to house and wire it. My demagnetiser took me all of 30 minutes to make and unlike the example you linked to can be used with any sized object. In theory I could use it upside down on the milling machine table if that needed degaussing.

Ian

300 degrees of wrap on a diameter of 80mm, and the wire only 0.004" thick, I would have though friction on slat surface would be more than enough. From your description I doubt any form of coating on Tufnol would help and it would alter the effective diameter (if that matters).

Is the wire under great tension or load?

How does the wire feed on and off the capstan, since you say it can wrap round several times?

Ian

Neil

What material are the parts you have had cut?

Ian

As Neil said these operate using a capacitive sensor method and it is totally unaffected by magnetism. I don't bother removing the batteries and it seems not to make a difference if it is switched on or not. (The caliper that is, as the demagnetiser does ideally need to be operating!

One of the old central heating pumps that have a flat SS diaphragm as non magnetic interface between the windings and the impeller idea as a bench demagnetiser, (they overheat if left switched on for too long)

Ian

Mike

I'm guessing that Ben Rayment is something to with the Website? If that is the case the lack of communication does not come as a surprise to me.

There is some form of one-way absorbent bog in the MHS management that prevents any information passing through (allegedly).

Ian

Chris, didnt you notice my smiley.

I was having a dig at this website really.

Compat mode is in Internet Explorer

Ian

Have you tried compatibility mode?

Ian