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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: 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.

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.

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

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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