Member postings for Stuart Harrison

In the winter of 1955-6 we regularly descended Snowdon by sitting on a slate placed on the rack, whilst steadying ourselves by putting our boots on the side of the rails. I do not remember seeing such excessive wear of the rack as shown in the photographs. This wear may be due to the quality of present day mild steel compared to steel produced by the Hearth process.

Stuart Harrison

Jon,

No, please send an e-mail to [email protected]

Stuart

Jon,

I have drawings and photographs of the circular stop as a .pdf file which I find difficult to post on this website. Please contact me.

SH

Jon, the 3d printed endstops were a failure and so I am now about to cast in Admiralty bronze using a 3d printed pattern. If successful I will be able to cast for other users. I have now bored out my spindle to fit the W10 collets of my Schaublin 65 lathe. Will post photographs shortly. I am still unsure of how to mount the circular endstops on a faceplte to machine the bearing surface.

Stuart

Dear Greensands,

Thank you for posting a photo of your makers plate. It shows that your machine is not a Woolwich cast off and that Hauser produced 9 mm. spindles for other buyers. The same supplier sold the machine depicted on the Lathes.co.uk website. Is it yours?

The photo shows the 9mm ER11 collet holder that I have made and used succesfully. I used the 30 degree cone to centre the collet rather than the body.

I posted details of the threads on my Hauser mill to assist Greensands and Alexandraeo Smith 1. Oily Rags contribution may have caused confusion. Hauser used different threads on their machines; the thread on the endstops of my circular table and slides are different. The following will explain why Alexander's purchased rod fits.

Prior to the eighteenth century screw threads for fasteners were mostly cut by hand but increasing demands deemed it necessary for them to be factory made. The lack of thread standardisation made fastener interchangeability problematical.

To overcome these problems Joseph Whitworth collected sample screws from a large number of British workshops and in 1841 put forward two proposals:
1. The angle the thread flanks should be standardised at 55 degrees.
2. The number of threads per inch should be standardised for various diameters.
His proposals became standard practice in Britain in the 1860's, so that ‘a nut made in Glasgow would fit a bolt made in Manchester’.

In 1864 in America, William Sellers independently proposed another standard based upon a 60 degree thread form and various thread pitches for different diameters. This became adopted as the U.S. Standard and subsequently developed into the American Standard Coarse Series (NC) and the Fine Series (NF). The thread form had flat roots and crests that made the screw easier to make than the Whitworth standard that has rounded roots and crests.

Around the same time metric thread standards were being adopted in continental Europe with a number of different thread flank angles being adopted. For example the German Löwenherz had a thread flank angle of 53 degrees 8 minutes and the Swiss Thury thread an angle of 47.5 degrees. The standard international metric thread (ISO 68-1:1998) eventually evolved from German, French and Swiss metric standards based upon a 60 degree flank angle with flat crests and rounded roots. The main differences between the early European standards was the shape and truncation of root and crest.

Since the introduction of thread standards large manufacturing companies have not always complied. A notable example is the pre-WWII Morris Motors bolts having metric threads and Whitworth form hexagonal heads! My Schaublin 65 lathe feedscrews have a diameter of 6.5 mm., 1 mm. pitch and 55̊ flank angle, which meant that I had to make my own tap when replacing the worn nuts. Therefore, when repairing or restoring old equipment it is essential to measure diameter and pitch of threads as well as examining their form. If the thread conforms, within tolerances to a standard then commercially available taps and dies can be utilised. I have posted a photograph comparing the Hauser thread to a ISO M8 x 0.75 mm. tap. This shows the threads to be similar within tolerance limits. I stated the Hauser threads in my post as standard ISO metric threads.

I have posted a photo of a relevant page in the English edition of the contemporary Hauser catalogue. These machines accommodated 10 mm diameter collets (0.393" = 9.98 mm.). The spindle on Greensands’, Alexander Smith I’s and mine, having a 9 mm. spindle were specially made for Woolwich Arsenal. I originally thought that I would make a new spindle for my machine so that I could use my extensive collection of Schaublin 10 mm collets but have now decided to bore out the Hauser spindle to 10 mm. If the spindle is made of case-hardened steel then the final finishing of the bore should not be too difficult to lap to the desired accuracy of concentricity and runout.

Wishing everone a quiet, safe and contented Christmas,

SH

I have placed a photograph of my Hauser endstops in my album. As seen in the photograph, I have three endstops for the slideways and one for the circular table, which means that I have to make three for the slideways and one for the circular table, The body of the Hauser endstops is a steel casting with a bronze threaded insert. The insert in the photo shows the square clamping pad which has to be cutout before the insert is fitted. The threads used by Hauser are: Slide endstop M8 x o.5 mm.

Circular table endstop M7 x 0.75 mm.

Clamping screw M4 x 0.70 mm.

Top adjusting screw M9 x 0.75 mm.

Spindle adjustment M18 x 1.0 mm.

Taps and dies are available for all of these theads at Tracey Tools.

Dear Greensands,

I have posted a photo of my mill in my album on this site. At the bottom of the photo you may notice the start of making the lateral carriage lever and one of my collets. The collet is a ER11 collet holder. The mill has provision for a counterweight below the table. I am making a table to hold the mill, my Schaublin 65 lathe and their accessories. My mill has some missing endstops; new ones are going to be cast in bronze. I have made the patterns allowing for shrinkage with my 3d printer.

I have nearly finished restoring my Hauser Type 33 Horizontal/Vertical mill. I purchased this mill in 1968 from an advertisement in 'Exchange and Mart'. It arrived as a rusty pile in an Ammunition box from an address in Woolwich and I assume it was from Woolwich Arsenal which ceased activities in 1967. A photocopy of a page in the Hauser catalogue accompanied the goods. The drawbar has a M9 x 1.25 mm female thread. I have made suitable collets of Schaublin W9 form wih these dimensions:- Body diameter 9 mm., Length 38.3 mm., max nose diameter 13.2 mm A photgraph is attached.

Edited By Stuart Harrison on 09/12/2020 20:27:08

Edited By Stuart Harrison on 24/01/2011 14:47:55

Edited By Stuart Harrison on 24/01/2011 12:30:09