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Member postings for Versaboss

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

Thread: MEW 182 - Wot no ...
02/10/2011 15:12:46
Posted by Terryd on 02/10/2011 12:09:33
 
Such articles are only useful if accurate. If not they should be challenged (see my comment below re. 'peer reviews'). If one mistake occurs how do you know there aren't more unless corrected? Which do you prefer, accuracy or 'no comment'. It's not about 'pleasing' anyone, but about accuracy.

[snip]

After reading the bit of Mick's article on cast iron, I couldn't bring myself to read the rest, I didn't wish to find other errors. Surely articles should be accurate, especially those aimed at novices, otherwise mistakes are perpetuated.
 
[snip]
 
Pointing out mistakes in published work is long established in all sorts of professions, especially so in medical, scientific and engineering papers where 'peer reviews' are essential to weeding out errors. It should not be seen as as criticism but as an established and valuable process helping to ensure accuracy. It ensures that the mistakes and errors we are all capable of are not established as fact by allowing them to pass unchallenged.
 
Regards
 
Terry

Thank you very much, Terry, for that above. It describes exactly the point(s) I wanted to make, partially unsuccessful as it seems. Well maybe I have a bad understanding of British humour...

Glad also that you commented about the 'cast iron is brittle in compression' claim.

I did not want to add insult to injury to bring this forward also.

Going back in shelter also (without bacco pipe, though ),

Hansrudolf

01/10/2011 11:38:13
Posted by Robert Dodds on 01/10/2011 11:14:41:
Mick Knight's beginners series certainly fills a need for many but I think there is a slip of the keyboard with respect to Magnesium in steel alloys - isn't it Manganese that is alloyed in steel to produce toughness?
I fear Magnesium is a bit fiery for steel alloys.
Bob Dodds
 

Aah, I'm glad I'm not alone! I was thinking hard if I should write about that; my fear was a bit to look like a know-it-all. But after searching a lot about Steel constituents I was quite sure my gut feeling was right.

Well I think something like that is not a 'keyboard slip'. Informations given for beginners should be correct. How about giving RPM figures with a resolution of 1 RPM? I already see the letters coming in:

"Help please, Mr Knight says I need 458 RPM to turn 1" BMS, but my lathe only does 420 !!!"

Or to (nit-)pick a bit more:

Steel with carbon content from 0.05 % to 0.6 % is called 'low carbon steel'

Steel with carbon content from 0.3 % to 0.6 % is called 'medium carbon steel' after Mr. Knight.

Question: what now is a steel with 0.5 % carbon??

(a possible answer could be: a 'slip-of-the-keyboard' steel --- )


Greetings, Hansrudolf

Thread: Square holes
15/09/2011 21:00:46

>>Time to get on with our loco.the question is how do you make a 5/16 square hole in 3/8 plate about 1 1/2 deep with out coming through the side thanks . <<

As a non-locomotive builder it would interest me which part of a loco needs a deep square hole in the side of a 3/8" plate. What's the purpose on the original, and how did 'they' make it? (supposing the scale relationship is the same).

Greetings, Hansrudolf


(**cking editor: when I use the quote mechanism I cannot return to normal mode!!! 

Edited By Versaboss on 15/09/2011 21:03:19

Thread: Newbie in France Needs Help
09/09/2011 14:21:39

Hmm - seems you never heard about Otelo?

It is an offspring from the U.S. Travis tools, and located in France. They have also an office in Switzerland. You can get all you want in tools, and also machines, hardware (screws etc), and even stuff like silver steel, ground gauge plate, plastics - you name it. Delivery by post in 2 days (in Switzerland; they deliver direct from France). The latest catalog has over 1500 pages and is 35 mm thick

www.otelo.fr/


Greetings, Hansrudolf


Thread: DRO Scales - BW Electronics
09/09/2011 11:14:51

Hi all,

since umpteen years I use a BW DRO on my lathe's cross slide, and a Chinese scale on the topslide

Here my solution:



No problems with this, well maybe keep eyes open when producing stringy swarf.

But I want to mention a warning also: BW produced (produces? dunno, was not on the website since years) a similar DRO with battery power. My example, which unfortunately rests in a drawer just now, was unusable. With the (expensive special type) battery the display was not stable, and a unstable DRO is worse than none. I rebuilt it, using a 'wall wart' like on the earlier types, and that made it working. Just have to find a place to mount it...

Greetings, Hansrudolf

Thread: spray coolant
31/08/2011 12:08:05

Nick, are you sure it is not a system to automatically oil the table ways?

Your description seems to be more appropriate to this. The 'extra bits of metal' is not what I consider an adequate description from a model engineer, though !

Greetings, Hansrudolf

Thread: RC engines of the future
25/08/2011 10:49:23

Nothing new under the sun...

In my youth ... well ... now just 50 years ago, I was control line flying as a member of our local aeromodeller's club. Among our members was a elderly (at least that was my impression then...) gentleman who built sailplanes with piggy-backed pulse jets. These he also built himself. I admit his speeds were not quite that high, but there were also no super-duper all digital and computer controlled RC systems. I don't remember if he had more than one channel, perhaps not. And we used to call the RC systems tip-tip controls; proportional systems came much later.

In the time between then and now I collected at least 3 or 4 plans for such a jet, but alas...not more.

Greetings, Hansrudolf

Thread: Commercial projects???
23/08/2011 12:53:53

Dear website members,

Just took ME4411 out of my letterbox. Now I was quite surprised reading in David's editorial about a 'commercial project' on the website (he means this website, doesn't he?).

I don't pretend having read each and every line here in the last weeks, more so because I was abroad for a couple of days. But I cannot remember anything about a commercial project. Can somebody update me on this subject?

And a further point: the remarks about toys and prams are really difficult to understand for us foreigners. Translation, please!

Greetings, Hansrudolf

Thread: No 4407 More Errors
03/07/2011 14:33:15

I cannot help but draw your attention to 'another one' which escaped the critical eyes up to now.

On page 39 there is an article about making a chuck adaptor plate for the Hobbymat lathe.

The text in the article gives the following data:

Hobbymat spindle flange diameter: 55 mm

Chuck internal register diameter: 56 mm

The drawing clearly shows a boss (for the chuck) of 55 mm diameter, and on the other side a recess (for the spindle flange) of 56 mm diameter.


If someone would produce such an adaptor, trusting and relying upon the drawing only,

he would be up for a nice surprise...

Not the end of the world I admit, but a sign of the quality checks done (or not).

Greetings, Hansrudolf

01/07/2011 10:37:18
Posted by David Clark 1 on 01/07/2011 08:54:48:

We have an illustrator, not an engineering draughtsman.
He lives in Greece so comunication is not perfect and is often slow.

Ah fine, you support the Greek economy. It surely can use any little help it gets

Greetings, Hansrudolf

Thread: I need a mill ? Manual or CNC??
30/06/2011 22:52:11

John, does what I see above mean that one can make parts just with the wizards of Mach3 alone? For a complete part one can run one wizard after the other,; the difference (compared to the 'usual' way via CAD-CAM) is only that the operator has to be near the machine for every step?

If that's correct, then it seems that this would make life much easier for many among us.

Greetings, Hansrudolf

Thread: Case Hardening - can't even harden a washer !
28/06/2011 10:06:58

C W, just saw your answer which arrived when I was typing. Seems you really have a strange type of hardening powder. Maybe this works only with a larger lump of steel; your washer stays not hot more than a few seconds I suppose (ok you wrote that too...).

I think I cannot help much in that case (nice pun, however...)

Greetings, Hansrudolf

28/06/2011 10:01:36

Ady, I'm sorry to say your 'answer' does not give much help to our friend C W.

Tempering colors have nothing to do with case hardening.


C w, from your description it seems you did not heat the washers with the hardening powder sticking to it.. Heck, a bad sentence I know. So another try:

- Heat the washer to red (or yellow, or cherry, or whatever you call that color)

- dunk it tn the powder

- heat again; let the molten powder flow around the part

- repeat if necessary

- drop the still red hot part in cold water

- test with the old file

if it still is soft, then something's wrong with your powder or your washer is stainless steel


Greetings, Hansrudolf

Thread: crankshaft bearing material
17/06/2011 10:30:47
Posted by duncan webster on 05/07/2009 20:24:50:
If you've got room you could bore out your phos bronze bearing and line them with white metal.

Duncan, do you know a source for White Metal in small quantities? I'm searching that stuff since years, but with no success. I'm sure it is still used in full size railways, but they need larger amounts I think.


Greetings, Hansrudolf

Thread: Three Jaw Chucks
15/06/2011 11:23:39

Rod, although this method goes against all the textbooks, it was advised to me by a chuck/workholding specialist some years ago. I just used this method when I mounted a very cheap Chinese chuck. With a tight fitting spigot this chuck was not very impressive, but after reducing the spigot diameter say 0.15 mm and adjusting the chuck as you described, I got a runout of less than 0.02 mm on a 10 mm dowel and about 20-25 mm in front of the chuck. I stopped the adjusting process then...

Maybe it's only good for that diameter, but could always be repeated if the need arises.

Greeting. Hansrudolf

Thread: The ongoing saga of John's floor
11/06/2011 22:58:59

Aah, Delrin!

So you possibly warmed the screw to 150 or so deg. and pressed two pre-formed oversize Delrin blocks around the screw? After this, machine the outside(s) to measure.

Greetings, Hansrudolf

Thread: When does one have to be concerned?
11/06/2011 14:53:32

Well I think it's time for an update. It is now almost 2 weeks since I complained about the missing MEW 177. I got some mails From D.C. and a Mr. Lewis, stating that

"We will ensure that these actions are fulfilled"

Nice it would be...

Today the postwoman brought ME 4406, with a correct and very legible address this time. But not the smallest bit ow MEW visible until now, and 178 went also out in the meantime.

My fear with all this is that some day I get a message stating that unfortunately all unsold issues have gone to the paper recycling place and we are so sorry that we cannot deliver the missing ones, but maybe we will prolong your subscription a number or 2...

, Hansrudolf

Thread: Things you do for 5 17s and 9d
11/06/2011 14:38:15

John,

this leaves me speechless (almost ).

I too do sometimes work for a silly price, but at least the material costs should be covered! I don't want to think what the steel you used would cost at my supplier's. The size of these things are a bit larger than what I usually do, but if I had to do it say in 4" scale I would need several days (yes I know I am not a fast worker).

I have a little job here which would really be peanuts for you; maybe I will ask you a quote!

(and, btw, considering your workload from where do you get the time for your regular postings??? )

Greetings, Hansrudolf

Thread: A plastic valve
09/06/2011 15:26:41

Amazing, Sam. You turn PTFE to dimensions measured in micrometers, so I suppose the tolerances are at least also in that region. I pull my hat, if only I had one !

May I ask what kind of lathe you use for that?

Greetings, Hansrudolf


Thread: Prams and teddies again
06/06/2011 12:09:52
Posted by John Stevenson on 05/06/2011 22:49:52:
.....
I'll deal with milling machine first as mill and lathe are two totally different animals, a lot of people think that a lathe is just a two axis mill but nothing is further from the truth.
 
.......
I'll do lathes later.
 
John S.

Hi John,

That's the kind of article I am waiting for, too. Gathering dust under the bench in my workshop is all the stuff for converting a lathe (to be exact: a spare cross/topslide) to CNC.

Linux comp with EMC, steppers, ARC stepper drives are ready, but other commitments have brought all to a standstill.

However, what provoked my posting here: I never grasped the notion that mill and lathe are fundamentally different, except that the coordinate letters are different. So I would be most interested to learn why it is so.

To give an example: can you explain the difference between milling a tapered front side on a rectangular bar, and turning the same taper on a shaft in the lathe. Is really more in it than the mill moving in y and y, and the lathe in z and x?

Greetings, Hansrudolf


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