Member postings for Alan Johnson 7

Geoff Theasby reported on the Auckland Model & Experimental Engineers. Of interest to me, because I have one, and I loathe hitting the draw bar to release whatever is in the quill, can Geoff or Graham Quayle or someone else expand on the topic "Simple Screw Pusher to Release the Drawbar" as I would be pleased to stop my brutality.

Regards,

Alan.

From memory - which is excellent after 30 years, I think they are the same, BUT I will ask for photographs the week after next.

I am in Paris now, back to Perth (Western Australia) next week. Back to work following week. I will email Douglas who is in Canberra - the other side of Australia, and post a reply.

Isn't the internet wonderful! In the past it would all be Airmail at best.

Alan

About 30 years ago I saw some old (200 years +) Chinese locks a friend brought back from Peking (then). He lived there, so had time to browse the markets. Very interesting.

Alan.

As was said along time ago by very wise men: "there is nothing new under the sun." Look at Roy Smalley's article in MEW 157 "Dividing on the Lathe." No pencil or rule used!

Alan

Perhaps make one.

See: MEW 178 P.46. An Oiler for the Myford Lathe.

I made one, and it works well.

Alan.

With ruler only (and pencil).

1. Draw line say 300 mm long. Mark the centre (150mm from one end).

2. Using the rule mark a number of points (many) from one end such as they form an arc (say 300mm radius).

3. Do the same from the other end. Where the arcs meet draw a line vertically to the midpoint. You now have a vertical line at the midpoint of the original line, which of course forms a 90 degree angle. Project that line below the original horizontal line. You now have four quadrants of the circle identified.

4. Calculate the tangent of any angle you like. I would cheat and use tables, but you can calculate the x and y co-ordinates. (That lesson will not be covered here!). As in (2) and (3) above mark the angles you want.

5. YOU AT THE BACK! SIT UP AND PAY ATTENTION!

I hope that helps.

Alan

Razor blades are still sold in Malaysia. I have a fried here who uses them. Perhaps they are also availabe in other parts of the world.