Here is a list of all the postings Stewart Hart has made in our forums. Click on a thread name to jump to the thread.
|Thread: Sine Protractor|
Just completed this sine protractor.
Its simple to use the distance between the centres is 100mm so to set it to desired angle its just the sine of the angle times 100 move the decimal place two jumps to the right.
This is how you set it:-
Zero you digital height gauge on the top of the roller.
For 30 deg the sine is 0.5 so the height to set the roller is 50mm
Then just use it to set your work at the angle
You can obviously work the other way and use it to measure angles.
|Thread: Tool Makers Clamps Variations on a Theme|
That's a useful looking bit of Kit Robert it looks as though the angle plate has been fabricated.
We've all come across the classic tool makers clamps I bet quite a few of you made them when you were at school or college. But I didn't realise just how many variations there were until I started browsing through some old American Machinist Magazines on line:-
So this is the score so far
The Classic these are my well used collection.
And a few variations I've come across:-
And this is my own effort of the last example
I made them as I thought they would be easy to use one handed whilst the other hand held something in place
Can any one add to the list ?.
|Thread: One Hand Operated Depth Gauge|
I came across this in an old American Machinist Magazine, and thought it would make a simple project, that would produce a handy bit of kit.
This is what I came up with :-
Its very Simple to use
Just press the rod until its reaches the bottom, the spring loaded plunger keeps the rod in place.
Then zero the digi vernier on the thick bar and then take the direct measurement of the hole depth,
I knocked this up in a couple of hours this morning.
|Thread: Starrett Tool Makers Steel Clamps|
Yes I know what you mean Neil I can appreciate the art in a a good technical illustration, Ashley Best does some very nice illustration for his tram articles in ME.
The American Machinist articles come from a time when photography was very much in its infancy, so you had to rely on the skill of the technical illustrator but this was the weakness in the system as the illustrator had to fully understand the issues of what he is illustrating, the clamps being used to Centre a bar is a good example of this:- In the accompanying text, it explains that the clamps have to be mounted the opposite way round so that the part is pulled on the centre line, but for this to happen the clamps needs to swivel slightly so that the parts comes across the diagonal the illustration doesn't show this.
Now a days with digital photography taking a photographs has never been easier and it captures everything but this is its weakness it captures all the background clutter and unnecessary detail and can hide the whole point of the picture.
Idle hand and all that, when the cold spell drove me out of the shed I did a little on line search on the archive.org site and came across some old 1900 ish publication called American Machinist https://archive.org/search.php?query=american%20machinist
And low and behold I came across these ideas for using the clamps.
Be warned that the link comes with a warning you can easily lose a couple of days of your life browsing it.
Thanks for your input Chaps, some I'd thought about some had passed me by.
I was a little puzzled why they are described as clamps then I realised that they didn't' have the tong, groove and keep to stop the jaw tilting, so I guess that's why they call them clamps, and not vices, because of this I think you must have to use them differently to keep the work square. I'm still thinking about the best way to configure the screw:- on centre, above, or below, what I do think though is that it must have quite a sloppy fit to allow it freedom to tilt and push the work up against the square fixed jaw and keep the work square.
I had a good look at the ones on ebay and the odd ones show signs of being modified.
Jason I did buy a pair from Uncle Ketan but was disappointed to find that they were far from being a matched set but to be fair to Ketan I didn't stipulate that I wanted a matched pair.
I've come to the conclusion that they would be most use as a matched set, so I've drawn them up as a pair tied together with some spacers plus I've put a groove down the side for clamping and I've left the end square I'll also add a V on the inside of the jaw for round bar and I'll put a V goove along the bottom of one so that it could be used as a V block not quite worked out a clamp for this yet.
Her's whot I've roughed out. Don't know when I'll get round to making them as I'm busy making the motion bracket for the loco I'm building.
Edited By Stewart Hart on 27/11/2017 19:16:31
Hi whilst browsing through an old Starrett catalogue I came across these Tool Makers Clamps
They are something I've not come across before and as they looked as if they could be a useful bit of kit I did a bit more research, and found out that Starrett still market a version of Chinese manufacture at about $60 each.
Starrett did sell them as a matched pair which would make them even more useful I've since found out that Brown and Sharp sold something similar but they had a V along the bottom so they could be used as a small V block
Has any one come across these before and have they got any experience of using them ?.
I don't think it would be to difficult to make a matching set.
|Thread: Beam Compass we called them Trammels|
Thanks for the link Martin, I think some of those old sets of drawing instruments are works of art in them selves, and as for those ink pens that comes with every set I don't know if any one has tried to use them when I did I had blots and splashes all over the place, in short I mad a right old mess, when you see the quality of the drawings those old guys did with them you have to take your hat off to them.
Just doing it Neil
Over the week end I made a Beam Compass or as we use to call them Trammels but I thing Beam Compass is a better description as the man said it does was it says on the tin.
Your probably wondering why I needed one of these old fashion drawing/marking out instruments in the modern days of cad. The reason is quite simple I need to draw large arcs in order to model the valve gear on the loco I'm building and my little lap top was just too small to be able to see what was happening so it was a mater of good old pen a paper to the rescue.
Edited By Stewart Hart on 22/11/2017 19:19:59
|Thread: Smoke box door internal clamp|
Just found this thead: I'm building an LMS 2-6-0 Crab that has the clamped smoke box door bin trying to think of away round the problems this may lead to a solution my club has a set of back issue for ME so will look them up.
|Thread: SX3 Mill Power Feed Help Wanted|
I've managed to get it to an electronics guy who I use to work with he's going to have a look at it for me.
I fitted a Power Feed to my beloved SX3 from Axminster about 6 years ago its been on the blink for about a month now yesterday it finally gave up the ghost and stopped working I think the problem stems from the direction switch or the capacitor it will jog when I press the stop button so its getting power to the motor I removed the covers and checked for lose/broken wires but could find nothing obvious, that exhausted my electronic capabilities.
I'm a complete novice when it comes to electricity I can just about wire up a plug:- so does any one know of a firm I could send it to to have it repaired it will set me back £400 to buy a replacement so a repair is well worth considering.
|Thread: Simple Mill Engine - Stewart Hart ME.4460 - Part CP11|
Looks very good from her
Nice work Jim
Its always great to see one of these engines being made by a beginner, as it was designed as a beginners engine, there must have been quite a lot made by now.
Can't wait to see a picture of the finished engine or even a video of it running
|Thread: pottyengineering Clamping Drill|
You'll get the exclusive Neil
I'll probably write it up and submit it to Neil.
I've got to draw it up first though as it was one of those jobs that sort of evolved around the bits and pieces I had around me with just a few rough sketches.
Thanks for your interest
Never thought of looking in the car boots for one of those Black and decker jobs they would do the job with a bit of modification
Just completed this clamping drill.
You can clamp the complete unit to a large work piece the idea is that I can use it to drill the frame of the 5" loco i'm building giving me greater control of the drilling operation.
It just comprises of a windy drill/die grinder attached to a large toolmakers, it slides up and down the pillar via a lever mechanism.
|Thread: English dialect|
Don't forget people from Stoke being clayheads
And as for fit you can't beet: "as lose as a prick in a shirt sleev"
As for finish you have:- "as rough as a Bear's arse".
Edited By Stewart Hart on 19/09/2017 07:39:44
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