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'Dickson ' type toolholders

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ven:
I made a set of 8 from mild steel many years ago, and I can't imagine going back to the old methods.  I never thought of hardening them but, if you wipe the mating surfaces every time before fitting them, they should last for ever.  One word of advice: removing the outer skin from the lump of bright drawn mild steel, then cutting a large slot across it for the tool to fit into, will cause it to distort slightly, so rough them out all over before finally finishing to size.  This doesn't matter too much, of course, except for the two angled surfaces.
If I had the larger machinery to made another dozen, I would.

Davo J:

--- Quote from: Jonny on December 01, 2010, 05:57:22 PM ---Lovely work from both of you, i need about twenty of them T2 for Dickson and dont have the time to make.

One thing i cant recall seeing any one do is make an integral threaded handle to replace the top nut and separate spanner.
First thing i did on buying a chinese plus converting and making two T slot tool post to save unthreading changing fixed toolposts over.
Only got these
http://pic20.picturetrail.com/VOL15/728921/1252422/14577361.jpg
http://pic20.picturetrail.com/VOL15/728921/1252422/56398906.jpg
Chinese 250-200 series http://pic20.picturetrail.com/VOL15/728921/1252422/311844089.jpg

--- End quote ---

Thats not me, it's another Dave.
I made the fixed handle on top years ago, but found it seemed to get in the way for the tool post spanner to swing and some jobs. Also I still needed a spanner for the tool holder anyway, so I made up a hex nut the same size as the tool holder cams, so only the one spanner is needed. I find it better as one spanner does everthing, and I can leave the spanner on anyone of them or take it off if it's in the way.


Dave

BillTodd:

--- Quote ---Lee
When I started making the holders, (some time ago) I did not bother too much with pictures. Sorry. As the two angled cuts were the most critical I decided to start with those, but had to rough out the rear central slot first. The main toolblock holder was stripped of its cam mechanism - this helped enormously. The angles could then be checked for fit as machining progressed.
--- End quote ---

Interesting, I cut the Vs first so I could get a rough centre from a line scribed on the face


--- Quote ---The toolholder blocks were just rested in a small V block in the vice.
--- End quote ---

I found I could cut both Vs in one set up by stepping across and down by the appropriate amount (ISTR this was 34mm across & down for the small myford sized blocks) The depth of the T slot is the only critical thing as I remember.


--- Quote ---The toolholders are unhardened, as I could not find anywhere local to do it, so it remains to be seen how long they last.....I wish I had a surface grinder too.
--- End quote ---

I wouldn't bother to harden them, it wont change the strength at all and there is no real wear mechanism so they should last until destroyed in a crash ;)


BTW nice crisp machining :)
Bill

Mike Cole:
Hi
I think that you will find that the chinese made ones are not hardened. I bought a couple last year and found they needed a bit of fettlling to fit.
Mike

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