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Member postings for john carruthers

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

Thread: Stepper Motor Flexible Coupling.
10/05/2020 10:34:59

We have used Oldham couplings for many years in telescope drives using steppers and VFO drives, never had a problem from the antarctic to the equator.
Even using software and encoders to cancel backlash, scope drives are very sensitive to drift as any astrophotographer will tell you where mili arcsec pointing is the goal.

Thread: Air supply to test run steam engine.
08/05/2020 09:00:56

For testing I use either a plastic pipe from the coffee machine steam outlet, or a hand pumped garden sprayer.
An old fridge compressor could be pressed into service?

Thread: Holding glass lens for grinding
27/04/2020 18:36:00

Ingals ATM vol 3 page 35 >

I have them in pdf if you need them.

Edited By john carruthers on 27/04/2020 18:37:01

Thread: What Did You Do Today 2020
01/01/2020 09:54:03


mini saw blades

Thread: Adhesive to bond metal to glass
01/01/2020 09:21:56

Try your local car dealership, they use a UV bond for attaching rear view mirrors to windscreens.
You could use high modulus silicone mastic but in both cases try to avoid contamination with silicon furniture polish. It is tenacious stuff.

Thread: What Did You Do Today 2020
01/01/2020 09:18:21

I ordered a set of mini saw blades (like slitting saws) from a Chinese supplier on xmas day, they arrived yesterday so I roughed out a 'scape wheel for the clock..

scape wheel.jpg

Thread: Resilient motor mount retaining clips.
22/12/2019 09:09:38

Have you tried high modulus silicone sealant? squirt it into the rings, let it set off.
Lightly grease any parts you don't want stuck.

Thread: The Workshop Progress Thread 2019
28/11/2019 09:09:57

After a year or so of renovating the new house I have finally found time to play in my shed.
This arrangement allows me to cut spur gears.
I used an old bolt for the single point cutter but will be ordering a cheap set of mod 1 cutters from China.

gearcutter2.jpggear cutter1.jpg

Thread: Watch and Clock Escapements
28/11/2019 08:53:40

Thanks for that, I'm at the stage of thinking about an escapement for a sidereal clock.

Thread: Thread sizes on flexispeed meteor lathe
20/08/2019 08:33:21

The spindle nose is 1/2" x 16tpi
If you look in my Flexispeed album there is a copy of the old type written manual..
flexispeed

Thread: Mill hand wheel upgrade
20/08/2019 08:22:05

Have you asked Arc Euro?
They carry metal hand wheels for lathes, maybe they would fit the mill?

Thread: "Oh, I do like to be beside ... "
04/08/2019 08:04:01

Re. the Folkestone sand pumping.
Every so often a loud clanging and banging was heard in the pipe and eventually a cannon ball would be deposited on the sand heap.
We told the manager it was skulls from a disturbed war grave at sea

"No! don't say that lads!! we're behind as it is.

Thread: Angle grinders - Dangerous or not
19/07/2019 08:45:58

What could possibly go wrong? wink

carving disc link

Thread: Tapping a thread
06/07/2019 18:20:05

use the plug but make the piece longer with a tapered lead in that you can cut away later.

Thread: Using a lathe
30/06/2019 08:22:26

The old tech scool I attended started everyone in the machine shop and carpentry shop at 11.

The metalwork master Charlie (Cog) Wheeler demonstrated the cutting eficiency of the bandsaw by bringing in some pigs trotters on the first day.
He said nothing, started the saw, sliced the trotters into little bits which he threw in the bin then said
"...the saw doesn't care. That could be your fingers, any of the machines in this shop WILL do that if you piss about with them".
End of H&S sermon.
There were a few scratches and minor bruises in there over the years, nothing serious, we all got worse in the corridors.

Thread: Chinese tacho - beware
20/06/2019 18:41:18

Fluke.

Fluke have 3 factories, 2 in PRC and one in Germany.
The Fluke multimeters are tested and callibrated on an instrument made in Deal, Kent, codename 'Baldrick'.
Each factory has 2 such testers.
The main problem in manufacture is the fake parts in the supply chain.
Even the PRC guys get caught out.

Thread: A depthing tool and escape wheel
11/06/2019 08:32:49

Maybe a vernier on the indexing head?
360/25 = 14.4 deg.
(= 14 deg 24 arc min ).

Thread: Quicksilver
04/06/2019 08:18:07

As an aprentice one of my jobs was to scrape the 'silvering' off the backs of old mirrors and save the scrapings in a bottle.
The mercury gradually fell to the bottom and was decanted off to be sold to 'the mercury man' who attended annually.

Alas, no more.

Thread: What are you using for Lathe Way Oil?
02/06/2019 15:30:22

iso32 'Jack Oil'

Thread: The Workshop Progress Thread 2019
30/04/2019 08:44:53

The new shed/workshop is finally erected, I've been aiming for a better set up since we got here last October.
8' x 10' from ShedsAhead of Port Talbot who did the installation.
Because of the slope and underlying limestone it sits on 18 4"x4" piles.

Next the power and light, then the benches. I've been saving the old kitchen units and worktops for this job.

new shed - copy.jpg

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