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Member postings for ega

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

Thread: Bending and welding acrylic sheet?
13/08/2017 11:12:02
Posted by Russell Eberhardt on 13/08/2017 10:10:40:

Am I the only grumpy old git who gets annoyed by the use of an adjective in place of a noun.

Acrylic sheet, yes. Acrylic plastic, yes. Acrylic, what does that mean? Have you ever heard of white metal being called white?

Sorry, end of rant. Not getting at anyone here. It seems to be common usage.

Russell

Edited By Russell Eberhardt on 13/08/2017 10:13:02

"acrylic" first appeared in the COD in the sixth edition of 1976 where it was both adjective and noun (in that order). My most recent popular dictionary (Chambers Concise) gives it first as a noun! By way of contrast, Collins COBUILD based on computer-analysed word frequency treats acrylic as an adjective.

"Wight" can be a noun.

I am certainly a GOG but I try not to get annoyed by these things.

Thread: Machining Tungsten
13/08/2017 10:58:23

It looks as though the heaviest safe material is gold?

Thread: Bending and welding acrylic sheet?
12/08/2017 16:33:59

Andrew Tinsley:

As you say, Perspex is (or was) a brand name. I have photo'd the label from some similar material (about 2 sq ft priced at 35p!)

dscn1404.jpg

As you will no doubt see, I have had to put two torn labels together to make substantially one.

Thread: cleaning stainless steel
12/08/2017 14:23:26

Michael Gilligan:

No apology needed in my case - I have missed your input.

I thought from Monoman's post that this was another case of specification creep (you may remember our discussion about Pear's soap). It may be nostalgia but my recent purchase of Jenolite seems less effective than before.

What is the difference between ortho and ordinary acid?

Thread: Bending and welding acrylic sheet?
12/08/2017 14:12:30

Andrew Tinsley:

I think your hot air gun with cylindrical former is well worth trying. By a modest coincidence, I tested this method of bending acrylic just the other day using the high setting on a cheap B & D hot air gun.

dscn1403.jpg

I should perhaps point out that the material is some decades old and its brittleness is apparent from the holes which were probably made with a hole saw. I didn't use a former and just continued heating until the sheet was willing to bend. From previous attempts I know that overheating causes undesirable bubbles.

Thread: Power File
12/08/2017 10:48:54

"So is copper worse than other metals in this respect?"

Can't be pulled out with a magnet?

Thread: Plums or Gages (i.e. Greengages)?
10/08/2017 11:07:30

Posted by Clive Hartland on 10/08/2017 09:16:23:

"With regard to the small Cherry plums, here they are known as, 'Bullis'."

Here in Kent they would be Bullace, I think

Thread: Key types - any advantages?
10/08/2017 11:00:56
Posted by JasonB on 10/08/2017 10:21:41:

Woodruff keys are often used on tapered shafts where it is easier to machine than setting the work at and angle to mill the slot and the taper takes the load and key just acts to locate the item on the shaft such a timing gears/pulleys.

I seem to remember that the Austin Seven had this arrangement on its halfshafts.

Either type of key seat can be machined on a vertical mill but the straight key way would perhaps be more difficult on a horizontal mill.

Woodruff keys and cutters are readily made in the amateur workshop.

I assume that model makers would aim for authenticity of key type.

PS Excellent illustration, Ignatz!

Edited By ega on 10/08/2017 11:02:24

Thread: Centre drilling long length, small diameter bar
08/08/2017 15:05:58
Posted by David Standing 1 on 08/08/2017 15:01:04:

PolyLactic Acid

Thank you. I see they are now 3D printing brain cells!

Thread: Identifying 6" Burnerd Chucks for Myford Lathes.
08/08/2017 14:49:32

+ 1 for No Logo just marked “1548-16130”

I also have a 5" 4 jaw by Bison marked 4304 - 125 which, unlike the light pattern Pratt Burnerd item, needed a backplate but is made so as to allow the backplate to sit partly within the chuck body with the result that the chuck projects only half an inch more than the PB.

Thread: Centre drilling long length, small diameter bar
08/08/2017 14:30:13

Bill Wood 2:

"What is JAR's name and what is the book called please ?"

Sorry if I assumed too much.

JAR is/was the late Jack Radford, a frequent albeit under-appreciated contributor to ME (Model Engineer). His book, Improvements and Accessories for your Lathe (TEE Publishing 1998) is a compilation of his c 1970s articles based on the Super 7 lathe. Much has changed since then but the book is still worth reading (or turn up the articles if available).

The relevant article is Stop Bars and Bushes for Lathe Mandrels.

OT: I sometimes wonder whether an in-forum glossary of accepted abbreviations would be helpful; I am still trying to fathom Neil's "PLA" - one of the most common TLAs but not the Port of London Authority!

Edited By ega on 08/08/2017 14:30:59

Thread: Boxford Cross Slide & Top Slide Disassembley
08/08/2017 10:14:24

Alan Charleston:

As I said, I don't know the Boxford and would add that I have no wish to alarm you. The two pins on the Myford are handed and it should be possible to determine which goes where by inspection.

Good luck with your project!

07/08/2017 11:33:30

Further to Robbo's post about the corresponding arrangement on the Super 7, I think I heard somewhere that it is important not to inadvertently swap the clamp pins ("thrust pads" in Myford speak) side for side as this may lead to it being difficult or impossible to remove the topslide.

I don't know if this applies to the Boxford.

Thread: Centre drilling long length, small diameter bar
07/08/2017 11:20:17

If doing this job I would grip the studding in the chuck (preferably collet) and support the tail end in a bush. JAR described a way of doing this in his book. This photo shows the tool in use:

p1030537.jpg

Please ignore the nut on the studding which was there as part of a temporary drawbar.

Thread: Unexpected machining content on the TV
02/08/2017 11:05:29

"the presenter is a bit too silly for my tastes"

Greg Wallace lost my interest when he went round the Brompton factory, hence my thanks for the pointer to something I would not otherwise have watched. His partner, who did the machining segment under discussion, seems competent at what she does bearing in mind that the programme is aimed at a general audience.

I wonder if Alan (the one-man band) ever goes off and leaves the CNC mill to get on on its own?

01/08/2017 22:39:11

Stuart Bridger:

Excellent spot! Significant that it needs just one man to do this.

Thread: cracked and chapped hands
01/08/2017 17:07:18

clogs:

Did you try O'Keeffe's Working Hands?

Thread: Source of Silver Steel
29/07/2017 10:57:34

Silver steel would not be my choice but if it were I would want to screwcut the thread.

Am I right in thinking that silver steel would wear better than mild or tool steel?

Thread: HF fluorescent lights
11/07/2017 22:51:21

I am awaiting with interest the experts' views on this as I have had rather similar problems: the ELCB trips when the workshop fluorescent lights are switched on, a problem which was apparently cured by changing the starter in one of the units.

Thread: Top slide stud too short?
11/07/2017 22:45:41

Tim Stevens:

Thanks for the clarification. I was actually thinking of the (maximum) number of tools the post will hold. That said, I don't own the Myford device and am interested to learn that it indexes eight positions as opposed to the four that my GHT version provides.

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