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Member postings for Alan Jackson

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

Thread: Parting off - front or rear
16/10/2021 11:03:19

I use this vertical parting tool on my Stepperhead lathe

and a rear mounted HSS parting tool on my Chipmaster

Both work well


rear toolpost1.jpg

Thread: Back to Imperial
18/09/2021 10:33:11

Just ask most people what is their height and weight to see how thoroughly they have adapted to the metric system.

I bet a pound to a penny they mostly reply in imperial. That's my two cents.


Thread: Purpose of screw on keyway
30/08/2021 16:40:17

I think the reason is that the end of the screw bears on a flat surface that can accept the slight gourging that the end of say an allen type grub screw will leave on the top surface of key. If the grub screw is oriented anywhere else it will score the shaft, making removal much more difficult.


Thread: Lathe improvements?
27/08/2021 09:31:58

Hi Niels

If you zoom up on the second photo you can see the screw heads in the chuck bore.


26/08/2021 18:29:02

Hi Niels,

Thank you for your kind comments. The screws are secured by locked screws that can be reached inside the bore.


26/08/2021 18:11:19

Hi Niels,

Re your narrow chuck, here is my own design narrow four jaw 6 inch chuck. The body thickness is 30mm. The jaws are guided by an oval gib that can be adjusted to eliminate slackness in the jaw guidance.


Slim bodyJaws extended

Thread: Looking for solution to incorrigibly jumpy needle roller bearings
17/08/2021 10:19:49

I have an older Stihl hedge cutter, electric motor driven. The con big ends have plain bearings (no needle rollers) It has been working hard for over 20 years and still carries on. the big ends and crankpins are slightly worn, it gets hot but still carries on, much like its operator.


Thread: Setting up rear parting tool properly
21/07/2021 17:55:05

This is much more rigid than the boat toolholder. The base block has a shallow slope enabling the cutting tool height to be adjusted.


rear toolpost2.jpg

Thread: Tool post height
09/07/2021 17:27:37
Posted by JasonB on 09/07/2021 11:22:31:

Alan, unless I'm missing something the holder still has no direct line of support under the tool and is over hanging from the toolpost which is the "disadvantage" people are talking about

Jason, You are quite correct but the cutting tool does not reach (cantilever) beyond the lower support so there is no moment created to make the topslide tend to flex or pivot. If I need a more solid toolpost I use a four way or triangular toolpost.




Edited By Alan Jackson on 09/07/2021 17:37:32

09/07/2021 10:32:12

MLA version QCTP with no overhang


new topslide.jpg

Thread: Uncertainty of Measurement [Global Warming]
07/07/2021 10:39:22

If they made the vertical scale more realistic say max 4 degrees then the chart would show a much less steep rise. Just what you can do with manipulated charts and figures.

Thread: Tool post height
07/07/2021 10:30:21

I entirely agree with SOD and Martin Kyte that the QCTP fitted to a typical small model engineer's lathe suffers from inherant problems, lack of rigidity due to less than perfect fits between the many introduced contact surfaces and increased cantilevered overhang from the support point below. These to reasons alone contribute to more problems than are solved by a QCTP.


Thread: Motor drive - belt, gear or direct?
21/06/2021 10:07:30

This what I did

front belt cover removed.jpghead assembly - right side.jpg


Thread: Fretting in Scunthorpe
21/06/2021 09:59:49

I bet the fuel tank is intact

Thread: Taper due to tailstock height misalignment.
04/06/2021 09:40:07

Vertical misalignment will make a small error, but horizontal misalignment will make much more error simply because the cutting tool moves in a horizontal plane.

Thread: Joe's Rocket
22/05/2021 11:37:58

He is my grandson's latest creation. When he goes into my shed he likes to invent something, he is five years old and shaping up well as a future model engineer. After he left this creation, I took the liberty to glue it together, hope he approves my input when he sees it, otherwise I'm in big trouble.



Thread: Open Technology Lathe Idea
16/05/2021 14:53:53
Posted by Nicholas Wheeler 1 on 16/05/2021 13:26:20:

I was surprised that neither Alan's articles, nor the previous one about updating small lathes didn't create any discussion. I preferred Alex du Pre's ideas, as they're easily applicable to existing machines yet improve some of the less satisfactory features; screwcutting and power feeds in particular

So was I Nicholas, When later I placed a short version on other similar websites there was quite a lot of interest,Stange.


16/05/2021 12:41:45

In MEW300 I proposed a small adaptable lathe that could be easily changed in stages from a simple basic lathe through to a version with powered axes then finally onto a fully CNC lathe that could also be used manually or a mix of manual/ CNC as desired. The version show has a cast iron bed but this could be simplified with rectangular steel bars. I attach a screenshot. There are many more screenshots in my album.


1-Lefthand view.jpg

Thread: Masso CNC G3 - Worth the price?
14/05/2021 10:40:22

I may be old fashioned but I have never had a problem with Turbocnc with a lathe and threading. It works with an old Dell laptop which needs a printer port and operates on DOS only. I am not a professional at this, it is only home workshop and probably quite slow compared to modern versions. It can deal with curves, feed/rev, G33, G76. tapers etc. It only works with one pulse/rev but it is reliable. The screen only shows G code but you soon get the hang of it.


Edited By Alan Jackson on 14/05/2021 10:41:04

Thread: Reading glasses - frosted area
04/05/2021 10:39:48

Much as I try to be careful, I seem to have created a small frosted zone, on my prescription reading glasses, right in my line of sight. I was thinking of polishing the frosted zone away. My question is what should I use to avoid making them worse by frosting the whole lens. I realise it is probably better to just renew the glasses, but it seems a waste to throw them away.


Edited By Alan Jackson on 04/05/2021 10:40:33

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