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Member postings for Mark C

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

Thread: VAT criticisms?
14/12/2016 22:41:50

Michael W, You clearly have never had the VAT man visit..... if you think any business is taking the tax man for a ride you should start a company and register for VAT, then you might understand the system a little better. As for it being a disproportional tax on the poor, if your living expenses are 100% of your income then VAT is a fifth of your wage. If it is only 10% of your income the tax accounts for one fiftieth of your income and the tax man sets about getting his pound of flesh by taxing your income at 40% instead....

Mark

14/12/2016 19:08:32

You lot need to check your spelling, you keep spelling it "banker"

Mark

Thread: Reaming for a sliding fit
06/12/2016 06:58:06

Or you could just by extractable pins.... ready drilled & tapped!

Mark

Thread: Telephone Scam ??
01/12/2016 10:58:39

On a slightly different note, I have a method of knowing who is distributing my email address.

It will only work for people who have email set-up that lets you put anything in front of the "at" sign. When asked by a shop (usually when you try and order something) for an email address, I give them one that begins with their shop name - so it might be Tesco@**my email domain**. They often think I am giving them a dud address and inform me that they have to have a real address but then realise that the address works and shut up whining. It works because any address that does not have a dedicated mail box goes to a "catch all" account that I can check and I then know if my address has been sold on!

Mark

Thread: Measuring PCD holes
29/11/2016 11:25:06

Ian, I would expect there to be some method to ensure concentricity but I imagine they may well form the up-stand at the hub center and form the bolt/nut seats at the same time having punched the holes previously. They may also blank and form at the same time but that would require significant press capacity as I am certain you already know. Unless they have a standard production sequence then each manufacturer will have their own variations on a theme depending on product and press availability.

Mark

29/11/2016 11:09:43

Small wheels may be blanked in one pass but not all are done that way. Here is a very interesting photo essay showing large 4x4 wheel manufacture from strip to paint booth **LINK**

Balancing is intersecting in it's own right (especially dynamic balancing) and the effects of altering wheel width, offset and diameter have profound effects on vehicle handling. It is a very interesting subject and there is considerably more to it than might at first be apparent.

Mark

Thread: Elliott 00 Omnimill
21/11/2016 16:14:00

Nigel, did that help?

Mark

20/11/2016 16:27:48

I have taken a quick picture of mine. You will see the drive dog at the back (it is the same on the slotting head). It locates in the horizontal drive slot. If yours is significantly different, take a picture and post it so we can advise if you want.20161120_162037.jpg

Mark

18/11/2016 20:05:24
The drive is off the slot. I am unable to post a picture but will do as soon as i get back to the machines.

Mark
Thread: Stiffness for an indicator mount
11/11/2016 22:01:38

This sounds like we might be looking at Shrodinger's cat (pun intended).

Mark

Thread: Lathe motor power
10/11/2016 11:03:55

The big problem with this subject is always when people get confused with the terms. As Ian notes, torque is simply a force applied to turn something - like using a spanner - and it does not need to be moving, simply pulling on an previously tightened nut will apply torque even if the nut does not turn. It only becomes power when it is moving and doing some work. So Hp is the act of turning the nut before it stops turning. As it is being tightened up you are doing "Work" pulling the spanner (applying torque). Obviously, tightening the nut slowly with a long spanner is easy and you would not need much effort (power/Hp). If you had the boss watching, you might tighten it much quicker using a short spanner (which is quicker to use as your arm does not have to move so far to turn it if you are holding the end) putting more effort in and this may result in getting a bit of a sweat on, or in engineering terms "more work/Hp. So, the same torque (the nut and bolt was the same) but the time to do it changed so the work done was in a shorter time and hence more power was required. This applies in all cases off gears, pulleys and levers etc. which is why a small motor can turn a heavy load using lots of gearing to reduce the speed. It is also why motors are rated in kW (power).

Mark

Thread: Mixing fractions and decimal units in an imperial drawing
05/11/2016 20:51:09

Jason, just looked at the prices!

I buy my stock from a mainstream stockist (account) and generally buy stock lengths and they don't do imperial unless it is stainless or Al (which depends on the source these days as to what units you will get). At that price, it would be cheaper to buy a grinder....

Mark

PS. I have recently bought a small pile of Vanadis (about 100 kg) - now that was really expensive.

05/11/2016 20:32:20

Neil, so you saying 20mm Dia. BMS should really be noted as "1/50 Mtr Dia." !!! Oo-er that's wot I been doin' wrong all this time.....

Mark

PS. Where do you get imperial ground stock - import it from USA or have it made special?

Thread: Locomotive Drivers
02/11/2016 09:46:08

have you tried terms like "Mannequin 3d solid human"

Mark

Thread: 3D mouse
02/11/2016 08:46:05

That's why I don't use one.

I find it easier to run the mouse in right hand and then my left hand is free to key in dimensions and hold my drink. manipulating the model is done by pressing and holding the middle button down or scrolling the wheel to zoom in or out. It just felt natural as opposed to needing both hands. I also like the way the software puts up a few obvious commands on a small pallet for the most likely thing you will need next. If I want the full list, right clicking brings a comprehensive list up.

Mark

Thread: Gyrosphere
01/11/2016 00:12:55

Look at this German company making them, it has a nice "war time" film at the bottom showing the theory. They are used in compasses - they look like they might be very expensive if in working order and someone needs it!

**LINK**

Mark

Thread: 3D mouse
01/11/2016 00:04:38

I don't do fusion, Solidworks only. Having said that, I went through the mouse thing when the "space ball's" hit the market and everyone assured me they increased productivity significantly but I can't get on with them and the cost was prohibitive at the time (a few years back now).

I now use a logitech gaming mouse (G700) which is great as I can program the buttons for shortcuts and sensitivity and the thing is wireless with rechargeable batteries in it - you plug it's USB "tail" in when it needs charging and the rest of the time it is a "hamster" (no lead! ).

For reference, the need to alter the sensitivity is to allow me to pick "hard to get" edges and vertices etc which are linked to the screen pixel size and hence getting smaller and smaller. I also program different acceleration and whatnot to suit normal PC use or drawing modes as they are quite different when you get fully conversant with your chosen drawing package.

Mark

Thread: Accurate angle on a scraped prism
30/10/2016 22:59:25

Is this not a job for a surface table, reference square and some different diameter dowels under the height gauge?

Mark

Regarding sine bars, a sine table might be more use but rollers should give some indication of the state of the prismatic face

Edited By Mark C on 30/10/2016 23:02:31

Thread: Jones & Shipman 540 Surface Grinder
30/10/2016 19:26:41

Well, not much response yet but anyway... It looks like the two bolts hidden under the thrust bearing support hold the whole thing together. I will drop the mast onto a support block inside and then release the feed screw nut and try removing the two bolts. There is another attachment on the top of the tube near the hand wheel that I could see from the off but it looks like it might come out reasonably easily. I think the key might be using a long prop to get the mast out of the way for tipping the screw towards the front of the machine so I don't need it over the pit to get it out.

Mark

Thread: 14mm spanner
30/10/2016 13:47:16

JS, yes, and the fact that you can "beat" one onto a jiggered 9/16 af head/nut is also a fact - one that might be useful to remember if you don't happen to own a nice set of snap-on flank drives.... Another useful cross over is 13mm can be persuaded to go on 1/4 BSW if I recall

Mark

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