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|
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.
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Push the fit for purpose sale of good act too far and a lot of drawings could be withdrawn.
|Thread: Myford T Slot size and suitable cutter|
That would make it 3/8 sloting cutter first then 5/8 * 5/32 Woodruff cutter
|Thread: Lathe spindle nose thread|
|Thread: 25mm clarkson autolock|
They also do an intermediate size that only takes the 25mm / 1" collet
|Thread: Miniature welding|
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.
|Thread: London Model Engineering Exhibition|
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.
|Thread: Stainless steel shaft|
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.
You might be able to detect in raw stock by rotating in a vee block with DTI mtd.
|Thread: Morse Taper Removal|
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.
|Thread: Number Drill Sets & Ba Tap sets|
The HQS source is here,
I have asked them what it is as i had not heard of it elsewhere.
|Thread: The Sandown Park Model Engineer Exhibtion 2011|
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.
|Thread: Interpreting drawing?|
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.
For those who want to try them you can get the alternative i linked to in the USA from here in the UK
I presume that you mean this style
I got one as a crab clamp off ebay last year but haven't found any since.
|Thread: New Blocks on the Block|
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.
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.
|Thread: what does this mean on a drawing|
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
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?
|Thread: How NOT to tap a hole|
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.
|Thread: My Super-7 trips out|
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.
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