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Member postings for john halfpenny

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

Thread: Naerok 350 mill
09/05/2021 09:38:10

I use newish A31 and A23. Its difficult at the extremes, but you will soon have enough variety to suit all combinations.

Thread: Mt3 extension for tailstock
02/05/2021 11:08:02

I knew the photo would cause excitment and instant advice. In fact my extension sleeve is used very occasionally to give an extra 15-20mm reach, typically for a small centre drill, and with the tailstock barrel almost fully retracted. So the net extra extension is very little, but in my case valuable for this particular circumstance.

02/05/2021 08:39:36

Here is my 3mt to 2mt extension, for comparison. Works well for me. From Arc.20210501_220110.jpg

01/05/2021 21:50:54

I use one Stu, for short/small twist drills where the reach is a little short. My dro scale makes the saddle a little wider, so that even my reversed tailstock doesn't quite do the job20200630_100735.jpg

Thread: Kennedy Hacksaw Dashpot Oil
01/05/2021 18:01:27

I found EP90 far too thin - the thicker oil gives better damping and feed rate control, but is difficult to get in the small quantity required

01/05/2021 11:20:55

Pull off the dashpot cover and get the lube in any way you can. The valve should be open, and you will need to be patient whilst the lube passes through the valve to the bottom of the dashpot. Then refit the cover. I use Ford Model A gearbox oil, a 160 weight semi-fluid grease, which just about slumps under it's own weight at 15C.

Thread: Eueka! - Has music been redefined?
27/04/2021 19:03:04

If you didn't copy, it's not copyright infringement. Copyright is a very limited form of protection, but of course effective if an exact copy is necessary in order to make money - as in copying a book which is within the copyright term.. However, you cannot stop somebody commencing a legal action, even on spurious grounds - so be prepared to state how your rights to the soundtrack came into existence, eg by composition, licence, agreement etc.

Thread: Clarke CL500M half nut conversion
23/04/2021 19:53:52

Hi Stuart, I intend to make this so some dimensions would help me scale and make a drawing. Perhaps block size and hole centre from top edge, and cam diameter would get me started. I think I can scale the rest to suit my material stock. PM me if you like. Many thanks. JH

23/04/2021 08:49:44

Well done Stuart. Have you made any drawings? - though it should be relatively easy to follow your video. This is something I have intended to do for some time as winding the lead screw is tedious, and it solves the only shortcoming I have not yet addressed. JH

Thread: What to do when you lose something
22/04/2021 17:57:23

I needed a large metric Allen key. Expediency lead to me grinding a fraction off a larger imperial key. A few years later I had to do the same job, but couldn't find the ground down key, so I ground down another to get the job done. Then I found the first ground down key, AND THE SET OF METRIC KEYS I HAD BOUGHT AFTER THE FIRST OCCURENCE.

Thread: A long in the tooth wannabe engineer
19/04/2021 22:13:43

Dave, the changeover knob moves in and out, and can be very stiff - it needs a good thump or yank, depending on which drive you are stuck with. If it moves down, the quill is not clamped tight.

Edited By john halfpenny on 19/04/2021 22:15:45

Edited By john halfpenny on 19/04/2021 22:17:28

Thread: Trademark Infringements
16/04/2021 22:20:00

Failure to supply certification does not mean it is not meehanite, but if it is not then the owner of the registered trade mark will have a straightforward enforcement case.

Thread: Gluing Aluminium
30/03/2021 15:55:29

Gluing aluminium is well proven. Most Aston Martins and JLR models are held together this way with two pack epoxy, and occasionally a rivet at the end of a linear run to guard against peeling, which I believe is the most common failure mode.

Thread: New car - or is it a wheeled computer?
26/03/2021 15:47:57

And another thing. Why is every increase exponential, and every problem existential. Do they even know what these words mean. Ah, it's stopped raining - tea time over.

26/03/2021 14:25:59

Dyson started it with his 'digital motor'

26/03/2021 11:20:43

Pre-2000 cars will run ok, but may benefit from adjustments to ignition timing and replacement of some rubber components.

26/03/2021 10:43:40

I should have said 'no longer printed' Mike - having said that, the newer ones are not great imho.

26/03/2021 10:08:09

I've got news for you Mike Hurley. Haynes manuals are no longer published. Me, I'm sticking with my Land Rover D3 and Reliant Scimitar

Thread: Lotus 7 and Mini 2 cylinder
20/03/2021 20:15:19

Howard, I think your memory is playing tricks. Post-war 14? , with B series? Also, I'm fairly sure that a C series is not a 'B' with two extra cylinders. Wasn't it an independent design from Morris engines?

Thread: My Dog Doesn't Bit
20/03/2021 18:58:53

Could the crankshaft side no longer be 'square' ?, so that the handle cannot apply sufficient torque without being forced out of engagement. IIRC, this is a problem for which an upgraded male/female is sold by A7 specialists.

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