Gallery, Projects and General > Scraping

Turcite from the far east

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PekkaNF:
Not sure how this specimen is manufactured. I imagine that some are cast to thick slab and then skived to certain thickness.

The glue side must be prepared, ususally etched or it bonds badly. The sample I got has two little bit different sides...one that I suspect is the glue side.

I rumaged my suff but I didn't find any normal non filled epoxy. Shops are not open this hour, I have some time to procrastinate, before I need to try.

Also I have completely run out of small sample cups....I buy like 50 of them and now that my daugter has been making up some of her own make up and does whole lot of painting, the cups just disappear. Plenty of lids left. Mystery.

Pekka

Pete.:
Pour water on it, it sticks to the side you glue, runs off the side you don't.


Well, on real Turcite it does anyway :D

PekkaNF:

--- Quote from: Pete. on January 27, 2018, 04:38:33 PM ---Pour water on it, it sticks to the side you glue, runs off the side you don't.


Well, on real Turcite it does anyway :D

--- End quote ---

Why I didn't come to think of that? :Doh:

Thank you very much!

Glue side is the side I suspected. It looked "etched". But very good to have confirmation.

Graham Stabler:

So I got some prices:

Turcite :  2.5mm x 200mm x 1 mtr . 465.00  + VAT
Price for adhesive   is 90.00 per pack + VAT

They didn't have a price list, said they would quote for a specific requirement and then gave a per m price anyway, go figure.

Graham

PekkaNF:
That sounds a bit expensive to me for non professional use.

I got some two componenet epoxy, consumer brand. First I lapped the key stock reasonbly flat. Then I cleaned the key stock and 10*20 mm pieces of this bearing material with IPA, waited few minutes and mixed slow cure epoxy. I tried to get very thin even coat of epoxy.

I stacked over a granite surface plate: Baking sheet, glued bearing material under the key stock and wighted them down with two 1-2-3 blocks.

Let them cure overnight and then checked them. A little of the glue has extruded out but no dollops or runs.

The surface needed a quick go with 400 diamond plate, it was not even for testing. It has clear bronze sheen on it, but I did not got clearly on camera.

First when I tested it to granite surface plate I was a little disapointed. It has not stick like metal or really flat granite. It also has some friction.

Then I tested it on dry and lubricated cast iron micrometer foot. It needed a little work and lubricant before the stick-slip feel decreased. Interesting.

I used some thin parafin oil as a lubricant and then it had a very nice feel. It still worked well when I pressed it harder. Some black material (grphite?) came in oil suspension.

I cleaned both surfaces and tried again. It still seems pretty much ok when it is used dry.

Would need some serious testing, because it feels a little different depending on how well it is bedded, amount of oil, pressure and speed. Tried to figure standard way of measuring...would need a good spring scale and try it on lathe bed. Anyway, it feels like it works.

Did not try to scrape or grind it with a TCG yet.

Maybe next step would be to measure thickness and put some weight over it to see if it is likely to cold flow during use.

Pekka

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