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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: Grinding flat, not curved, relief angles on HSS lathe tools
11/06/2018 08:11:18

A belt sander will flatten a slightly curved tool face, if you need to, or an angle grinder.

Thread: steambox for ply
09/06/2018 09:03:46

We used a large oil drum to bend 2x 8mm marine ply for shields, pushed steam from a wall paper stripper in one hole and out the other.

Thread: Metal combinations for a plain bearing
06/06/2018 08:59:33

to add to the mix; how about miniature split bearings that could be tightened as required? could be as simple as a V and a plate?

Thread: Clean hands?
26/05/2018 08:34:26

As kids we always came home covered in beach tar, butter would dissolve it in no time .

Swarfega with a handful of sand chucked in the tin will move most stuff.

Thread: Brass bar , 55 mm - ?supplier
22/05/2018 08:21:40

Trepan them from sheet?

Thread: Superglue for holding workpieces
17/05/2018 08:23:03

Good carpet tape will take light cuts. I've used it for wood turning as well as metal, no porblems.

Superglue - again for light cuts but melts when hot. Back up with a centre where possible.

Thread: Telescope project
13/05/2018 08:35:20

Nice mount yes

I've been helping AWR in a small way with their PEM...

**LINK**

Thread: Precision diameters
13/05/2018 08:25:20

Before testing optics I let the temperature of the work piece equalise for 30 minutes in a bucket of water that's been in the room for a day or so, might speed up testing for you?

Thread: drilling a 20mmx 300mm Hole in cast iron
11/05/2018 08:21:26

How about regrinding the carbide end of a cheap 20mm masonry drill to suit CI ?
Far cheaper than long and extra long series bits.

https://www.bes.co.uk/20-mm-x-300-mm-sds-drill-bit?ref=gs&gclid=EAIaIQobChMIk6aF84_92gIVDZPtCh0C8QK2EAQYAyABEgKaz_D_BwE
 

Edited By john carruthers on 11/05/2018 08:22:22

Thread: Removing Aluminium From a Cutter
04/05/2018 08:08:24

I use Pound shop oven cleaner to remove ally, usually an overnight soak shifts it.

Thread: sundial drawings
22/04/2018 08:15:21

I use 'Shadows' to design simple dials.(used to be free, now comercial)

Also 'Orologi Solari'.
**LINK**

There are several books available but mine are all packed in boxes ready to move house.

Several links here...

**LINK**

Thread: Department of Work and Pensions
20/04/2018 08:23:21

4/- per week, 16/- per month, it all adds up you know wink

Maybe a fund for fallen women ?

Thread: Ball bearings
18/04/2018 08:47:40

We have purchased several sets of bearings from Arc, some for machine use, some for light duties in telescope mounts, no problems..

**LINK**

Thread: What did you do Today 2018
28/03/2018 16:50:32

B&Q, yes, my bro-in-law works the a local store.
4%??
and the rest.
£10 cheapo white box drill, costs £3.
Amazing really how it is manufactured, then shipped round the world, and still shows a small profit, for £3.

Couldn't buy the chuck for that

Thread: Scrap yards
25/03/2018 08:49:47

At my favourite yard they let me look in the bins and pull out likely treasure.
Then we go through the ritual of weighing it, to within 10 grammes, then to the office to 'calculate' a price;
which myseriously always works out to be a multiple of £10 ?
wink

Thread: Magnetic Radiators
25/03/2018 08:42:35

Rad and True Rad ? wink

Thread: Thechnical issue regarding plaster.
24/03/2018 08:53:47

Can you get hold of some AFP? (acrylic flexible plaster), not cheap, but as it's a small area it shouldn't cost the earth.

Thread: Microscope rack and pinion
23/03/2018 08:32:43

mic pinion done.jpg

I had to repair one of Flemming's brass microscopes with just this problem.
It was a straight cut rack and the pinion had lost 3 teeth.
I managed to build up the 12 tooth steel pinion with a tiny welding electrode, skimmed it true, then ground a profile tool to cut the teeth with the lathe as a shaper.

fleming microscope (2).jpg

Edited By john carruthers on 23/03/2018 08:33:48

Thread: Trouble finding brass H and I columbs and beams
23/03/2018 08:16:45

Try a glazing supplier, we used a lot of brass H and U for stained glass, as an alternative to lead cambs.

Thread: Telescope Laser Collimator
12/03/2018 07:59:33

Only 3 !!?
cheeky

I just gave a 12" Newt/Cas Fullerscope and an 8" SCT to Monkton Observatory, still have a shed full to take with me to Wales.
I should thin them out a bit more, but it's like choosing which child to leave behind .

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