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Member postings for DC31k

Here is a list of all the postings DC31k has made in our forums. Click on a thread name to jump to the thread.

Thread: Colchester Lathe Factory
31/05/2019 07:06:11
Posted by Hopper on 30/05/2019 12:46:45:

Best part though is cleaning those casting mould boxes by spraying kerosene with a blow gun, then casually lighting a piece of paper from the (very) nearby blowtorch and flashing it all off. LOL.

Would it have been kerosene? He says 'spirit carrier', so much more likely alcohol-based. Paraffin ignited in that manner would be rather smoky.

What interests me is all the gold-coloured machines they use to make the lathes. Did they paint them up specially for the film or was every machine in the factory that colour?

Thread: help with gear calculations
31/05/2019 06:52:31
Posted by Pete Rimmer on 31/05/2019 06:40:30:

I'm just an enthusiastic amateur so don't ever take my word as gospel, but I agree with Andrew. The long-addendum profile would be correctly generated if you were hobbing, but not if you are cutting with a single-tooth cutter since the shape is so far departed from the cutter's form

I think you are correct. In everything I have read concerning addendum shift to prevent undercutting, it is always mentioned in conjunction with GENERATING methods. Indeed, the undercut is produced precisely because of the generating action.

I would be very interested to explore the concept of doing addendum shift with formed cutters. I need an 18t 14DP 14.5 PA gear but the centre hole required is a bit big, so want to try cutting 18t on a 20t blank. Perhaps one has to do something akin to cutting bevels with B&S cutters and shift the blank between passes.

The shifted profile gears JS used to post pictures of were hobbed. KG Stock Gears of Japan has some good information online.

31/05/2019 06:40:50

To the OP. It looks like only the inboard side of the pinion is worn. Use the existing teeth as a pattern, File out the incomplete teeth on the outboard end, cut it off, rotate 180 degrees and glue it back on.

Given that your lathe was made to imperial dimensions, it might be wise to invest in a set of dial calipers of the same language.

Thread: How does this collet work?
29/05/2019 21:20:04

What does the writing on it say?

I have a few of these and they are all for letter-size drills. If you squint at the picture, it looks like an 'R' on it, which would be closest to 8.5mm (but could equally be an '8'.

Thread: Cast Iron For Boxford Change Gears?
21/05/2019 20:41:17
Posted by Brian Wood on 21/05/2019 18:06:08:

Doing the maths, 135/127 = 1.06299 where 68/64 = 1.0625. There isn't another choice available either I'm afraid

There are in fact three other choices available that give better approximations than 17/16 (or its multiples). 84/79, 101/95 and 118/111.

While none of these are common gears, to say that nothing else is available is not correct.

In any discussion of change gears, the many continued fraction calculators available online for free are an invaluable resource.

Thread: Long time reader, newly joined
15/05/2019 19:36:56

Good evening to all,

As title, I have been reading this forum for a long time but did not have a lot to ask and even less to say. However, in recent weeks, some things in the workshop have cropped up wherein I would appreciate the sage advice of people here.

Looking forward also to contributing a few things I have not seen mentioned here.

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