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New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by Muzzerboy on Today at 07:28:57 AM »
I got one of these recently. Wifi camera that fits into @5mm holes, with built-in led light, works with your phone and only a tenner or so. I'm not stupid enough to use it for its alleged purpose but it's ideal for examining deep, narrow bores like yours.

https://www.aliexpress.com/item/1005009894988752.html?spm=a2g0o.order_list.order_list_main.58.13a51802c6uM3r
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New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by awemawson on Today at 07:27:12 AM »
The bolts arrived at last: First task reduce t he last few threads as suggested by Mike, but how to hold them. Normally I'd take a suitable nut and saw cut to make it into a split collet - but no 7/16 UNF nuts. Ah but I do have a 7/16 UNF Die - naughty but it'll work:

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Now we need 'pushers' as the hole is deeper than the bolt thread:

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So screw them in and see if they work - answer YES!! though I have to make progressively longer pushers.

We have lift off:

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That's enough excitement for one day - I have to go to Heathfield and buy some sheep wormer !


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New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by awemawson on November 06, 2026, 08:26:59 AM »
Very sensible suggestion Mike. Similarly I'll make my packer pieces a loose fit in case the ends bell over.
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New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by smiffy on November 06, 2026, 06:01:05 AM »
Before using the bolts it might pay to reduce the last couple of threads to the root diameter in case when tightening the bolts
the last threads are damaged and  expand into the taped hole making them difficult to remove. I speak with experience of this  happening .  Mike
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New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by awemawson on November 06, 2026, 05:52:40 AM »
Still waiting for some 12.9 grade bolts to use as potential extractors, but in the mean time I've tapped those two 9.9 mm holes out to 7/16 20 TPI. 15 threads so 3/4" deep should give enough thread engagement I hope.

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There seems to be a distinct ridge in the hole about 25 mm down as though the front disk in the centre of the tool disk is a separate part - perfectly possible that the bolts trap it against a flange I suppose. Can't get a decent picture down the tapped hole but it's more visible removing one of the holding bolts.

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If the bolts arrive tomorrow all should be revealed
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New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by awemawson on November 04, 2026, 01:45:51 PM »
Yes Mike that also dawned on me a couple of hours ago prompted by the hole beings almost 3" deep!
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New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by smiffy on November 04, 2026, 12:21:57 PM »
No need to tap full depth ,go as deep as possible and insert a small piece of brass bar at the bottom of the hole and wind the bolt onto that .   Mike
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New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by awemawson on November 04, 2026, 09:12:51 AM »
Curiously the larger of those holes in the rows of three is precisely 9.9 mm and shows no sign of ever having been threaded. It does as far as I can tell go all the way through to the flange - this is assuming that there is a slight locating recess in the back of the tool disk, which the drawing does seem to confirm.

So what thread has a tapping size of 9.9 mm ? Chat GPT tells me 7/16 UNF 20 tpi so if this is true I shall tap those holes and see what happens ! Obviously can't tap right to the bottom UNLESS i CAN PRODUCE A 7/16TH UNF tap with a 90 degree end which should be possible if I have enough standard taps to sacrifice one.
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New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by awemawson on November 04, 2026, 06:53:12 AM »
Thanks for your thoughts chaps.

I have a feeling that the tool disk currently on the lathe will be easier to dismantle than the broken spare one but I'd still like to get that apart first to see what's what. Latest plan is to lug out my rather heavy magnetic drill (it's old school not Temu!) and drill out the broken off bit and tap those outer holes for a strong 'push off bolt'.

Need to do some careful measurements to stop the drilling before breaking through into the main casting and either create a flat bottomed tap, or push off bolts with reduced ends to pass through the inevitably tapered end of the tapping.

Why does everything get so complicated !
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New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by pycoed on November 04, 2026, 04:46:47 AM »
Re the forks:- how about welding  loops to each C channel to fit over the forks? More secure than clamps - probably (have you SEEN my welding?)
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