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Member postings for S.D.L.

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

Thread: Not fit for purpose
10/05/2012 14:59:38
Posted by Joseph Ramon on 10/05/2012 14:47:31:

One has to laugh. But perhaps someone should gently inform Eric that model engineering is a hobby and yes, the drawings are almost entirely drawn by amateurs

Joey..

Which was my point despite the spelling mistake, and as pointed out the same sort of errors are seen in industry, and many go uncorrected.

I also suspect that some models are made to sketches and drawn up afterwards.

Steve Larner

10/05/2012 12:47:29
Posted by Eric Cox on 10/05/2012 10:47:48:

When asked if drawings from My Hobby Store were "fit for purpose" the responce was

"What a silly question.Of course I can't guarantee they are fit for purpose."

I'm sorry but "not being fit for purpose" contravenes the Sale of Goods Act.

Depends on your definition of fit for purpose.

I have never worked on a product in 30 years of engineering where there isn't errors on drawings and a marked up print with corrections somewhere, that someone keeps to work to but doesn't feed back through the change note system.

many of the drawings published today are obviously drawn by armatures, but that doesn't mean a model cant be made without a bit of cross checking and the odd remake.

Push the fit for purpose sale of good act too far and a lot of drawings could be withdrawn.

Steve Larner

Thread: Myford T Slot size and suitable cutter
18/04/2012 12:54:21
Posted by MICHAEL WILLIAMS on 17/04/2012 23:23:23:

Width :

Basic slot 3/8 .

Lower slot 5/8 .

Height :

Upper slot 7/32 .

Lower slot 5/32 .

All in inches .

That would make it 3/8 sloting cutter first then 5/8 * 5/32 Woodruff cutter

See Here

http://www.buckandhickman.com/find/category-is-CT+Cutting+Tools/category-is-CT03+Standard+Machine+andToolroom/category-is-CT0303+Milling/category-is-CT030306+Woodruff/product-is-026691

Steve Larner

Thread: Lathe spindle nose thread
27/03/2012 12:55:24
Posted by Con Nicoll on 26/03/2012 23:40:23:

I am trying to positively identify the spindle nose thread form for my Murad Antarctica lathe.

It's 1 3/8'' diameter x 10 tpi.

I have tried Measuring the angle with both 55° and 60° thread cutting tools but without grinding the tip of the tool off it's difficult to judge the angle accurately.

I first thought it to be 55° whitworth form however this does not seem to be a standard size. Can anyone advise

Hi

several points

  1. Hold a strip of card or shim at the side of your screw cutting tool this will make the tool wider with a flatish end, and allow you to see which fits best, without grinding the end off the toolbit.
  2. Buy some thread pitch gauges you will always use them. need 55Deg for BSW BSF ME etc, 60 deg for UNC-UNF. plus Metic and BA
  3. By standard size I assume you are comparing with fasners nuts and bolts. When it comes to non fasners designers use TPI and Dia to suit the application. It becomes standard tothat product and sonetimes it gets documented in a national standard other times it doesnt.

Steve Larner

Thread: 25mm clarkson autolock
08/03/2012 19:22:49
Posted by John Stevenson on 08/03/2012 00:11:04:

Yes in the large series, can be had with 25mm collet, 30m collet, 1" collet and 1 1/4" collet.

John S.

They also do an intermediate size that only takes the 25mm / 1" collet

Steve Larner

Thread: Miniature welding
01/03/2012 13:04:28
Posted by Paul Boscott on 09/01/2011 18:52:11:
Thank you again for all of your contributions
And I will take that as a NO then and put my funds to some other way of doing it
Thank you all for your help
Paul

Paul

Give Merv a ring and go and see what he can do with a tig welder.

The Ripple size can be varied which becomes obvious when you have lots of the same item made in different fab shops. So this may help your scale issue.

I hahe seen 16 gauge but joints that you could hardley see the ripple and others that looked like overlapping sea shells.

Steve Larner

Thread: London Model Engineering Exhibition
19/02/2012 16:15:00
Posted by Bazyle on 19/02/2012 13:13:58:

I remember a time when that magazine used to count every model at a (different) show and crow about the total. Show jealousy is not exclusive to model engineering as any Landrover enthusiasts will know every year we get a load of tosh about the Billing exhibition.

Looking back at the very first post there is some confusion over the identity of shows. LME is what we used to call Pickets Lock for its first few years. It has only been in those two venues.

Not quite only two it had a spell at Wembly Arena after picketts lock, remember it so well as some pratt stove my door in , in the multistory.

Steve Larner

Thread: Stainless steel shaft
16/01/2012 22:07:03
Its a common problem with center less grinding and needs a mic with a vee anvill to detect as it can measure the same at any position with a std mic.
 
See here.
 
 
And here
 
 
You might be able to detect in raw stock by rotating in a vee block with DTI mtd.
 
Steve Larner

Thread: Morse Taper Removal
16/12/2011 16:54:37
At technical college many (35) years ago it was always a good sharp tap with a lead hammer.
 
Most workshops I have seen a similar or a big copper mallet.
 
Was always told 1 big tap with a decent soft faced hammer was better that lots of little taps.
 
Steve Larner
Thread: Number Drill Sets & Ba Tap sets
13/12/2011 09:29:24
The HQS source is here,
I have asked them what it is as i had not heard of it elsewhere.
 
Steve Larner
Thread: The Sandown Park Model Engineer Exhibtion 2011
10/12/2011 23:49:17
Was the best show for several years.
 
Thought it was better with the competition models at the end and the club stands upstairs.
 
really enjoyed it.
 
Steve Larner
Thread: Interpreting drawing?
01/12/2011 07:18:35
Posted by Cornish Jack on 30/11/2011 21:53:32:

 
Anyone remember Harry Hemsley? I am starting to feel like him when he used to produce his catch-phrase. "What did Horace say, Winnie?" I can cope with upside-down but nil comprende 2nd angle, 3rd angle etc!!
However, to strike while there are lots of knowledgeable folk about. ...the new piccy is yet another that I 'see' as being upside-down. It is item 19 in the exploded view and connects the hot piston to the little end yoke.

TIA
Rgds
Bill
Detail drawings such as the shaft are often not drawn in the same orientation as the assembly drawings. They are often rotated to fit the paper orientation portrait / landscape etc or so that a certain face is easier to detail or see.
 
I would guess long thread down with a nut used as a lock-nut.
 
Steve Larner
Thread: Clamps,
23/11/2011 10:10:03
For those who want to try them you can get the alternative i linked to in the USA from here in the UK
 
 
Steve Larner
22/11/2011 10:18:14
Posted by charlie on 21/11/2011 20:41:16:

Hi Chaps,
Anyone out there know where i can buy ( Crab Clamps), I think
that is what they are called but i could be wrong,
I presume that you mean this style
 
 
I got one as a crab clamp off ebay last year but haven't found any since.
 
Steve Larner
Thread: New Blocks on the Block
18/11/2011 15:38:47
Posted by Michael Gilligan on 18/11/2011 11:46:23:
Steve [S.D.L.]

"Why would anyone ..."
.

If you can let me know of anywhere that I can obtain metric series, high tensile caphead screws; with small diameter heads and fine tolerances, then I shall happily withdraw my suggestion.

MichaelG.
 
As far as I can tell the head dia on 1/4 UNC/UNF cap heads is .375" and a M6 is 10mm about .393". I know many claim size matters, but does a18 thou (0.5mm) difference make much difference?
 
So I cant see anyone making then in imperial sizes.
 
Steve Larner
18/11/2011 10:42:38
Posted by Michael Gilligan on 18/11/2011 10:30:38:


An open request to John Stevenson:
Would you please suggest to ARC, that they might offer a version with either UNF or BSF threads, and the appropriate clearance holes?
... This would make a Good Thing even Better.

MichaelG.
 
 
The choice of clearance whole size is down to the designer, it can be as close as you want with the proviso that the location of any holes has to be more accurate,
 
Why would anyone design a revised / new product to us a screw that has been obsolete for 30 years or more (BSF).
 
They look good to me as all of Johns other products for Arc-Euro do, Ordered mine as soon as they were flagged here.
 
Steve Larner
Thread: what does this mean on a drawing
16/11/2011 19:26:29
Posted by mgj on 16/11/2011 10:20:54:
Also you will find that reamers and the like are classed as Hx as well. The standard I think is an H5 IRRC, but you can get what you wan't - if you want to pay for it.
 
I believe that Dormer and presto are normally H7 inline with the Din standard.
 
This page also tells you the tolerance on the reamer.
 
 
and here-for Dormer

 
Steve Larner
15/11/2011 15:47:21
Posted by Duncan Jennings on 15/11/2011 15:14:49:
hi chaps just perusing the drawings that came with my german "bengs" stirling engine, I think the drawings have been translated into english as the wording is a bit dodgy, however there are lots of references to drilled holes ,borings etc that are written as 6H7. 4H7 10H7 and one PCD which is listed as LK17.
is H a wierd german decimal point?
 
thanks in advance
 
Duncan

6H7 means 6mm tole tolerance H7
 
This can be looked up here
 
 
Column down Left hand side is tol class H6 H7 etc actual tolerance changes with size so look across top and find range in 3-6 so tolerance is -0 + 8 um ie 6.000 to 6.008
 
ON the LK ref is the PCR or PCD 17mm?
 
Steve Larner

 
Thread: How NOT to tap a hole
08/11/2011 14:25:29
Just like using a battery drill, ok down to M3 / 6BA.
 
WD40 is fine for Aluminium , have used spit when on a site visit and nothing else available, 1st choice is tapmatic, don't like the gooey pastes such as Trefallux anymore.
 
Steve Larner
Thread: My Super-7 trips out
08/11/2011 13:14:42
Have you got, or know someone who might have access to a clip on ammeter to measure the motor current?
 
Is the overload a 3 phase one used on single phase? If so are all 3 overload circuits wired in series to stop nuisance tripping due to unbalanced coil loads.
 
Steve Larner
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