Member postings for Roderick Jenkins

Posted by duncan webster on 06/05/2021 18:34:47:

Posted by duncan webster on 12/04/2021 18:14:19:

Neat

Rod

I always drill with the er25 chuck in the mill. Takes up less headroom than a drill chuck and changing the collet is less hassle than extracting a 2mt and drawbar. For really small holes I use one of arc's micro drill adaptors in a half inch collet.

Rod

Keith,

Another cracker.  I love the anodising 

Rod

Edited By Roderick Jenkins on 01/05/2021 20:56:17

My thoughts exactly. I "shazamed" my video but it failed to identify any music...

This might amuse you. A German speed metal band called "Rage" has claimed that the soundtrack on my YouTube video showing the action of a Eureka form relieving device has infringed their musical copyright. Apparently the "music" to be heard between 1:16 and 2.18 minutes was composed by them. What do you think?

After I challenged their claim they still maintain that their copyright has been infringed !

Rod

Rats, typo in the title

Edited By Roderick Jenkins on 27/04/2021 15:00:20

I remember my mum telling me that when she worked in the office of the local electricity company in Brighton just befor the war that the sevice engineers where paid £2 a week. So, one weeks salary for a working man to buy the castings and half a crown left over for beer at tuppence a pint.

Rod

One advantage of carbon steel taps over HSS is that they it can be softened by heating up the whole thing to say 400C (hotter than "blue" but not as hot as "cherry red" . The offending tap can then be drilled out.

Having said that, I have great confidence in spiral flute taps which I now use confidently down to M2. The evacuation of the swarf makes them much less likely to sieze

Rod

Edited By Roderick Jenkins on 21/04/2021 15:33:19

Try a search for Comsol. Most of the Model Engineering suppliers in the UK stock it as well as CuP alloys who stock their own version in both cored and solid.

HTH,

Rod

The spark test does work - best tested by comparing with 2 known specimens. Measurement is pretty good as well since most mild steel bars are a couple of thou under the nominal diameter whereas silver steel is usually less than half a thou under.

HTH,

Rod

Duncan,

Very nice. I shall look forward seeing the results of your flagstone fabrication. When I finish my Farm Boy, the next project will be the Sanderson Beam engine - it's going to need a floor.

I've spent the last couple of afternoons making this Instrument Vice. The base casting is a CES product that has been hanging around (like the Level I recently made) for decades

There were a couple of hairy set ups but no excitement ensued

Stay well,

Rod

Hi Martin,

I had to go searching, it's the Chinese chuck thread.

**LINK**

Stay well,

Rod

But only 26 years since Mr Bradley's demise. However, it was good of you to go to the trouble and I'm sure no one will mind

Stay well,

Rod

Stew Hart has a youtube video of a traveling steady for small diameters that might suite

**LINK**

Rod

I've got one of the Axminster ones which I bought for use on my drum sander. I believe it is made from raw (un-vulcanised) rubber.

Rod

I've used this nickel acetate method with success. I do however use a laboratory type variable DC power supply (only because I've got one)

Geoffrey Croker YouTube video

Rod

Quite a lot

Motor Glider - Wikipedia

Peter,

Have you considered contacting your local (Inverness?) computer repair/shop? I am sure they can put something together to your specification for a competitive price, tailored to your specific needs.

HTH,

Rod

Sweet

Rod

Just got one of these:

Draper 37023

Works very well. Cheapest version was on Amazon. Prices ranged up to nearly 40 quid on ebay.

Cheers,

Rod

The recent discussion about vernier height gauges prompted a thought. The problem I have with my vernier gauge is that a) It can't be zeroed and b) more importantly it's really hard on the knees since I have to squat down to read the scale through the bottom part of my varifocals. It occurred to me that I have a caliper type scale left from my budget milling machine scales. This is what I made:

Not particularly elegant - made from the oddments box. I checked it against my workshop gauge blocks and there appeared to be a slight systematic error checking up to 4" height. I then had the thought to check the verticality of the scale against a square and after a tonk with a hammer it reads 4.000" and 0.500" against the appropriate gauge blocks. I am very pleasantly surprised and it's definitely good enough for marking out and it cost me nothing. Although the scale is hardened stainless the body is not since I had no problem drilling and tapping for the thumb locking screw.

Cheers,

Rod