Member postings for Alan Jackson

I use this vertical parting tool on my Stepperhead lathe

https://www.youtube.com/watch?v=S8HvS13L7MU

and a rear mounted HSS parting tool on my Chipmaster

Both work well

Alan

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.

Alan

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.

Alan

Hi Niels

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

Alan

Hi Niels,

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

Alan

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.

Alan

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.

Alan

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

Alan

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

MLA version QCTP with no overhang

Alan

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.

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.

Alan

This what I did

Alan

I bet the fuel tank is intact

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.

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.

Alan

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.

Alan

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.

Alan

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

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.

Alan

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