|Neil Wyatt||19/07/2018 19:33:45|
16428 forum posts
I complemented Gary on the choice of colour, and he confided in me that they just came out like that!
It is a lovely example of the patternmaker's/foundryman's art.
|Michael Gilligan||19/07/2018 21:45:25|
13798 forum posts
I have no objection to the colour, but I'm a little bewildered: The toolpost block is said to be made from investment cast Ductile Cast Iron. ... So, why is it not grey ? [glazed by residue from the burnt 'wax' perhaps ?]
|Ian Parkin||19/07/2018 22:10:22|
640 forum posts
I had never realised that cast iron would come out of the mound looking like this ...die cast yes but not cast iron...I cant imagine what causes the colour
|Eccentric Engineer||20/07/2018 08:34:43|
22 forum posts
Just thought I'd clear up a slight misunderstanding about the brown colour of the Turnado tool posts.
|Michael Gilligan||20/07/2018 08:46:03|
13798 forum posts
Thanks for the useful clarification
Edit: idle curiosity has just led me to find this discussion: https://www.finishing.com/26/97.shtml
Edited By Michael Gilligan on 20/07/2018 08:59:47
|John Haine||16/12/2018 18:20:52|
|2591 forum posts|
Well I was really interested by this thread and thought it would be nice to have something like this for my little Unimat. I didn't want to fit it on the Myford because the toolpost doesn't get moved off that unless I really can't avoid it since all the tool calibration would be wrong. Unfortunately the official versio won't fit such a small lathe, and having just made a tangential toolpost/holder I thought it might be neat to make my own miniature version.
I found this nice steel plate with the two faces turned flat and parallel in the material I inherited from my dad - very dirty and a few dings but cleaned up nicely. Clamps to a bar under the bed with a csk M6 bolt. I thought that I'd need to mill a vee slot on the underside but found that the small flat on the top of the "prism" of the front bedway is co-planar with the real way.
This is the tangential holder bolted down to a 1/2" brass block, also found lurking in the scrap box and machined all over, and down to a thickness to bring the tool tip easily to centre height. Brass slides easily on the steel plate. Note that the block projects under the tool tip so there's no tendency for it to tip when cutting.
First attempt at turning a bit of brass rod (after sucking up all the swarf).
So I feel slightly bad about copying at least the principle of Gary's design but couldn't have bought one to fit anyway. I can feel a pen coming on...
|Michael Gilligan||17/12/2018 08:22:37|
13798 forum posts
That's excellent, John
|Ian S C||17/12/2018 10:23:21|
7440 forum posts
I think the colour of the cast iron is not caused by the lack of carbon in the metal, but by the excess of free carbon, what ever, I like the colour, hope it is durable.
Ian S C
1141 forum posts
With the correct moulding 'sand' just about any but the finest detail will come out, provided the CI is up to scratch.
Geoff - What a wasted year I've had 😪
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