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| Set-Over Centre |
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| grayone:
Hi Wong, I have a question as I bought the kit as well (it's sitting in a box still in my workshop 5,000 miles away unopened) You have just mentioned possibly buying the 2MT arbour. I assume by this comment that the MT2 comes as a piece of silver steel and not a stub machining arbour. If this is the case I think I would also buy it as they are not very expensive and my skill level is probably not good enough yet (or ever :() to be able to make one. Graham |
| wongster:
Hi Graham, The 2MT arbor came with the kit with a section that can be machined. I was referring to the 2BA adjustment screws that have to made from the supplied silver steel. Have you come across 2MT arbor with stub of about 1-1/2" long? Planning to make set of tap & die holders. Thanks. Wong |
| grayone:
Hi Wong I found one in the UK at http://www.axminster.co.uk/groz-stub-arbor-prod21342/?searchfor=340307 2 MT with a machinable end 1" dia and 1 1/2" long. Graham |
| andyf:
Wong, once you have finished the set-over centre, you shouldn't find it difficult to make your own MT2 arbor. I have enough travel on my topslide to make one, which is what I did for my die holder (it doesn't hold taps). That way, you can make the cylindrical section along which the die holder slides as long as you like. Some of my dies are small (13/16", or about 20.6mm) in diameter, so the cylindrical section had to be smaller than that. If I had bought a soft-ended arbor, a lot of steel would have been wasted getting it down to size. I hang the tommy bar down between the bedways, so the holder can only turn a few degrees as I crank the spindle and workpiece by hand. Andy |
| wongster:
The 1/2 Centre was completed this morning, though much is desired when come to hardening it. It was my first real attempt at hardening and quenching in water. The test with a file, as described in some text I read, left some scratches on it. I'll try the hardening part again when I completed the entire project. The "edge" of the 1/2 found. Drilling the hole for tommy bar after centre drilling. The plan called for the hole to be 3/32" but I would like to use the Sherline's tommy bar, which is slightly smaller than 4mm. With the 4mm hole, I'm too close to the edge near the threaded portion. Using the Sherline's tommy bar to remove the Centre for deburring. Mounted to the Base to hold it in the milling vise and milling away to almost 1/2 of the taper. Done. I couldn't go further with the mill as the edge of the Base blocked the endmill holder Completed but before hardening. After the first attempt in hardening. I heated the job till it glow and quench it in the little contain of water. I've had a hose near by (can be seen behind the torch) to spray water as standby. You may be able to see the scratches caused by a file. Hardening not done right? After I completed this part, I saw GeneK's comment on not directing the flame at the tip. Wish I read his comment before I started... While assembling the parts, I realized that the 1/2 Centre threaded portion extended out a little too much into the Base. The excess was carefully milled flush Another attempt at hardening was carried out before putting the parts together. The cap screws provided are a little too long. They'll have to be shortened in the next session. That's all the work on Sunday morning. I'm looking forward for my next session which will likely be next weekend. |
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