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Member postings for Ian P

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

Thread: Man management
12/07/2021 21:10:51
Posted by not done it yet on 12/07/2021 18:51:36:

I have no idea why this is a topic on a model engineering forum, where the vast majority work on their own, as hobbyists, without any particular time constraints and while safety is an important subject it does not really affect us in law.

I think that MyTimeMedia might be the only source to categorically state that that the 'majority' of users on this forum are 'hobbyists'.

I dont know how one could determine the ratio of model engineers here compared to the rest of the members but as a non model maker I certainly do not feel lonely.

Ian P

Thread: How to turn this bush
08/07/2021 18:01:27

I think this task is being seriously overthunk!

Depending on the intended purpose, if this was a 4ft length ground bar between two 3" long journals (created by line-boring) then one might need be able to get a very close running fit. For Sam's application (bearing in mind we dont know how true or straight the shaft or the tube is, nor do we know the surface finish of the shaft.

For a a shaft running in a plastic bearing to have a long life, the shaft surface needs to be very smooth and preferably polished. There are plastics specially formulated to run without lubrication and ready made bushes are an online purchase away (Google IGUS).

The longer the bushes are (and 3" is unusually long for a 1" shaft!) the more the straightness of the shaft becomes important. I know nothing about boats and rudders or what forces are involved but even a 1" shaft bends when it has overhanging loads at its ends so aiming for a close engineering fit seems a bit OTT for this application.

If you do want to machine your own bushes from Acetal then rough drilling/turning the OD and ID oversize with the stock projecting from the chuck followed by turning and boring to size with very sharp cutting tools is the way I would recommend. My only other recommendation would be not to make the bush a press fit in the tube as its likely to buckle before its pressed all the way home.

Ian P

Thread: 2.5mm thick mystery 'Formica' type sheet. Is it still available?
15/06/2021 20:23:43
Posted by peak4 on 15/06/2021 13:36:53:

Is this the same stuff, if so, the ad lists the manufacturer as SAS whoever that may be.
https://www.buildingmaterials.co.uk/laminate-skirting-3048mm-x-100mm-black

Bill

Certainly looks the same stuff so I spoke to their sales department today. They only have the same 100mm wide strips which they purchase from SAS International in Reading Berkshire who are a big player in the fitting out of prestige buildings. From the SAS website it does not look like they actually manufacture the raw materials but they are major wholesalers and supply a lot of the partitioning companies.

My search goes on.....

Ian P

14/06/2021 15:06:47

I contacted the company that Jason linked to and they stock cut strips (100mm wide 3m long) of the exact material I am looking for. However they are unable or unwilling to give me the name of their supplier or even what the material is called, as far as they are concerned its just 'skirting laminate'

TBH their supplier might not be able to help as the sales person I spoke to said they had tried to get 150mm wide strips from them and been told (the warehouse) only stock 100mm.

I'm pretty certain the strips are cut from large sheets as visually the long edges appear to have been sawn whereas the ends are definitely unfinished.

Its frustrating to know this material exists and that regardless of what search terms I the only hits are to partition skirting (and there are not many of those).

Black glass Tufnol sounds interesting, presumably, even though black its RF properties would be OK, the control unit has an 868MHz transmitter and a 433MHz receiver (common low power remote control frequencies).

Ian P

13/06/2021 20:23:50

I've not come across Trespa but it might be suitable, 3mm seems thin on the ground. One thing I noticed on the descriptions in the website Rod linked to was this statement

'Keep in mind that HPL expands or shrinks faster than other plastic panels' !!!

Ian P

13/06/2021 20:14:20
Posted by Emgee on 13/06/2021 17:00:19:

I used the same material for engraved signs until I got fed up filling the colour and went to the much more expensive Traffolite sandwich 2 colour engraving material. The skirting material I had was only 100mm wide.

I think paxolin sheet is the closest substitute these days, Tufnol with reinforcement would not be suitable for engraving but may suit your use.

Emgee

Did the material you used have a name?

Seems odd that the only known use of this material is for skirting. It extremely heavy and dense and although I dont know all its properties its virtually incompressable and the 7"x2" oddment I have hardly flexes when I try to bend it using hand pressure. 1.5mm mild steel the same size/force would be permanently bent.

The intention is to engrave and fill but its only a few characters per panel so not a problem.

Ian P

13/06/2021 19:46:32
Posted by JasonB on 13/06/2021 19:22:15:

Laminate Skirting

I did see that on my searches yesterday and was planning to phone on Monday and ask what the material is. With it being described as 'laminate' I thought it might be of laminated construction and not homogeneous.

I need to make 20-30 panels about 240mm square so I need to find 8x4 sheets or whatever 8x4.

Its for equipment used in tropical climes and needs to be transparent to radio frequencies so metal is out. 3mm is about the maximum we can use and not many plastics are stiff enough (push button and other controls mounted on it) Acetal is too floppy and too shiny, rigid PVC is too soft, Paxolin, Tufnol etc are either wrong colours or too expensive hence looking for this skirting stuff.

Ian P

13/06/2021 16:23:00

About 20 years ago I purchased 150mm wide and 2.4m long strips of a very hard laminate type material that was used as a kick strip/skirting as one of the elements in the office partitioning industry.

The company I bought it have moved or disappeared and I'm struggling to find any reference to any sources.

The scrap bit I have is very much like Formica but apart from being much thicker seems to be homogenous solid black all the way through. The front surface has a very fine satin brushed finish and its rear face has the coarse brushed finish seen on the underside of kitchen laminates. Physically its very hard and rigid, wears out drill and cutters rapidly and gives off a phenolic like smell.

Does anyone know what it is and whether its still available?

Ian P

PS The odour when machining is like burnt Bakelite

Edited By Ian P on 13/06/2021 16:24:44

Thread: 14mm/1mm wall OD SS tube, Where from?
07/06/2021 13:41:44
Posted by JasonB on 07/06/2021 13:31:32:

14 x 0.5 wall any good

That would be perfect if it was in stock. I've trawled all the PC cooling fraternity and a few list that same tube, but none have any stock.

1mm in pgk2's link will be suitable so thanks.

Ian P

07/06/2021 13:24:59

I need about 20 pieces 50mm long of 14mm OD tube with a minimum bore of 12mm. I have not found any UK suppliers with 1mm wall but there are some that list 1.5mm wall but none seem to have stock.

In my searching I discovered that SS 14x1mm was quite common until recently as it was used by gamers for the water piping in PC cooling systems, nowadays though its been replaced by rigid plastic tube (its cheaper? but its best feature is the colour choice!

I could make the parts I need on the lathe but chopping tube (using a plumbers pipe cutter) will give me nice radiused ends.

Has anyone got any surplus PC tubing I could buy?

Ian P

Thread: BSW Fasteners
23/05/2021 22:37:02

Purist might complain, but I would think that 1/4" UNC might be a lot easier to find and will hold the chuck in place.

Whitworth threaded fasteners are a getting rarer and rarer and certainly not used in new designs, whereas UN fasteners and threads are used in current production in some countries (well the USA at least)

Ian P

Thread: Metric or Imperial, Fractions or Decimals
22/05/2021 21:01:05
Posted by John Stevenson on 23/01/2011 01:45:38:
Fractions?
 
I have yet to see any machine tool with the dials graduated in fractions.
 
Wood working machines don't count, we are talking accuracy here not axe strokes.
 
John S.

My hero!

Ian P

Thread: Help with Electrics on a Bow Bending Iron
19/05/2021 13:36:45

I absolutely 100% endorse what Robert Atkinson-2 wrote above!

More information about the equipment itself would help us suggest how it could be made safe to use, questions that occur to me include,

What temperature does it operate at?

Is it temperature controlled?

If so, do each of the ali blocks each have their own temp sensor?

Are the two block held in some mechanical jig, hinged frame etc, or do they just bolt together in use?

Whilst the wiring and accessory bits visible are designed to be heat resisting, we can also see nylon cable ties which do not seem to have been melted/overheated, so maybe the operating temperature is no so high?

Fastening terminal blocks or other parts to a plate on short standoff spacers would greatly reduce their temperature and probably make assembly and wiring easier and be something perforated protective enclosures could be attached to.

It does not look like this equipment is a commercial product as it certainly should not be on the market as it is. I have in the come across products with mains cables with just a knot and grommet (and choc-block) terminals stuck down with hot-melt glue. Nowadays fortunately we have better regulations, CE and other certifications.

Ian P

Thread: How to countersink on a Mill?
12/05/2021 09:40:25
Posted by AdrianR on 12/05/2021 09:13:52:

Jason,

Thanks for the video, I actually searched your youtube to see if you had an example of countersinking. Being able to see and hear the machine defiantly makes a huge difference. It was watching your videos that finally made me choose the SX3.

The 12.4 looks much better, and of course, is not so obvious when you make it too deep. I was aiming for 14mm as that is what is on Howard Halls plans and I am trying to push myself to work accurately.

I guess using the quill instead of the Z feed, has the advantage that pulling the handle down is also pulling the head down too.

The head may move down (an almost immeasurable amount) until the point that the countersinking cutter touches the job and then the head will (try to) move upwards as a reaction against the downward movement of the quill.

Ian P

11/05/2021 22:31:31

Demurrers might be, but cutters are more 'snail' shapesmiley

11/05/2021 22:11:52

In my experience, single 'flute' countersinks (crossdrilled hole type?) perform best if they are allowed to 'float' and centre themselves, so are good if the machine is not rigid.

For countersunk recesses use a countersink ground to the just over screwhead diameter so there is a small parallel counterbore to hide the edge of the screwhead.

Ian P

Thread: Cutting holes in copper
09/05/2021 19:04:36

'Better' depends on circumstances and what equipment is available.

Your step drill followed by boring sounds good. Fly press and punch would be another way.

Ian P

Thread: Shipping to the EU - beware!
05/05/2021 22:21:01

I have just spoken to the owner of a company that frequently sends and receives goods to and from abroad.

Something that took two or three days to an from the EU now takes two or three weeks. Last month he had 9 shipments arrive via UPS and they bill him £40 each time as an 'import charge' and have not explained the breakdown of the charge. He is not happy!

Its very depressing and I dont see it improving, I cannot say I have been affected but I have stopped purchasing things from abroad.

Ian P

Thread: B&D workmate
01/05/2021 15:46:31

ron hickman plaque.jpg

01/05/2021 15:43:37

Not actually a Workmate, but an accessory that Ron Hickman suggested I could to fasten to my workmate.

I met Ron a few times a Lotus related car shows and he sometimes carried a briefcase that contained a stock of plywood plaques and packets of small woodscrews.

Ian P

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