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Stew makes a Bogstandard Tram

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sbwhart:
I've been wanting to make one of these since John excellent thread. In actual fact John kindly offered to make one for me, but today I had a grim choice:- weed the garden or spend the afternoon in the shop:- there was no choice the shop won:- the weeds will have to wait for annihilation another day.

I thought it would be useful for some one else to post a thread, how to go about the job following Johns methodology, but using different Kit and materials.

Link to Johns thread http://madmodder.net/index.php?topic=822.0

So here we go

This is the material I used



The DTI came from RDG http://www.rdgtools.co.uk/acatalog/CLOCKS__DIGITAL___MANUAL.html

First Job clean up the Ally block with a fly cutter







I didn't take a pic of this but I ran a small rad around what was to become the base of the tram with a 1/4 radius slot drill

Next job was to work out some sizes as I wanted to use the Tram for x and y I measured the widest distance across the table.



From this I did myself a crib sheet



And blued the bar and marked out the hole centres and the bits to cut away



The bar is sitting on some slip gauges I'll use these as parallels, if I used normal parallels the drill would hit them as they broke through, but by spacing the slips as shown in the pic it would miss.

This is my set of slip gauges they were given to me by a friend who worked at Roles Royce they were scrapping them off, because they had been used in the machine shop and were out of calibration but were talking an error of 0.00001" thats plenty good enough for me.



The bar was set up in the mill vice the edges of the bar found using my old fag paper trick from this I could centre the drill in the middle of the bar and using coordinates find the hole position the marking out is there just as a check. Then it was centre drilled then 7.5 then followed by the finish size of 8mm



Next job mill out the bit in the middle so that tram would sit on feet.



The centre holes was counter bored to take a counter sunk cap screw.

The bar was then de-burred flipped over 90deg the ends slit with a 2mm slitting saw



Then it was drilled for the clamping screws M4 and one side drilled M4 clearance  to make the clamp work



Tapped on my new tapping table  :D



Well this is it so far not bad for an afternoons work



I'll finish it off tommorow morning  so the weeds will get another short reprieve

Stew

websterz:
Judging from the finish on your aluminum block your machine is already in pretty good tram! Good write-up, looking forward to the rest of the story. I guess I better go out and find myself a deal on a pair of matching dial indicators now... :doh:   :thumbup:

Bernd:
Looking good so far.

Glad you found an excuse to go to the shop. Did I ever tell you how long.............ah never mind.

Can't wait to see you finish it off. I might even have to make one for my two mills.  :beer:

Bernd

Darren:
Looking good there Stew, you are flying now.... :thumbup:

bogstandard:
Now wasn't that easy.

Very well done.


John

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