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Thanks for your replies, sorry that I did not visit for a while. The wedge grips look interesting. How to accommodate it in a spinning chuck though.

I had a better idea using flat plate for the gripper teeth and I came up with this

I think this is what I had in mind.

Thank you for your interest. I think that it is a good idea, but it might be that the piano wire is too hard for the teeth to grip. I am thinking of 3 rollers that deform the wire and clamp it with some kind of spring loaded outer sleeve that can be retracted to allow release. I have looked all...

I am making a machine for making piano bass strings. What I need is some ideas of how to make a chuck for gripping the centre core of piano wire to hold it under tension. A drill chuck would not be suitable.

I am making a set of pistons 2.65" dia and need to cut ring grooves 0.85mm (0.334") wide and 3.8mm (0.150") for the top rings. What sort of tooling would you use? The material is aluminium. I am using the lathe as a tool grinder but the hss tools that I am making keep breaking. Is carbide the...

They are going to be case hardened but thanks for your interest. The cast iron lap seems to work well on an old pin. lost a couple of tenths in 5 minutes.

They look posh, but I think I could get by with some bent metal and a hinge with some iron and lapping compound. That is an amazing catalogue by the way.

I have to make my own pins. They are 9/16" x 2. 3/8 long which will be case hardened. Any ideas for lapping to the high finish required? I have some cast iron bar that I can use to make laps and some coarse carborundum but how will I get the fine finish?

Today I found that the cooled product is very thick - almost like honey or golden syrup. It seems too thick to use on sand.

I just made about 3 litres of Sodium Silicate. 1 kg of sodium hydroxide (€12.91 plus €8.00 shipping) From Amazon 1.5 kg Silica gel (cat litter) (€5.00) 2.5 litres of water. As soon as the sodium hydroxide was mixed with the water I added the silica gel in it's out of the bag state. When the...

That's the stuff. It seals the egg shell.:D

I will try the Brico then. Thanks.

The reason is that I am in France and the cost of shipping due to it being classed as liquid makes it uneconomical.

I want to make SS from cat litter and liquid drain lye. All the recipes seem to use the dry type. One recipe is thus: 320g lye 800ml water 480g cat litter How should I compensate for the liquid lye? It is for making cores when I do cast iron in greensand.

I am in Bellac 87 Haute Vienne Need help finding greensand and refractory suppliers. Humphrey

Hello again folks. The electronics are now virtually complete using a Arduino Mega. A kind chap wrote the code for me. Since then I toasted the Mega and am now waiting for a new one. I tried using a shuttle-less design for the loom, but it was too much going wrong with the selvage so I changed...

The place I worked at used sulphur powder to fix grinding stone rings to a backing plate. Just apply the heat and hold your breath. Never heard of one coming off. I often use soft solder paste to make false centres to a hardened shaft.

I am giving up on sand casting. There is only so many times I can make up the mould only to see it wasted again. I learned a lot. Next step will be lost wax process. Sorry about the pics, but there is not much to see anyway. Thanks for the help.

Well, that did not work either. Would it be better to try the lost wax process? I have no idea how that works, but is the mould heated and the molten brass poured with the mould still hot? I have a brass French clock with fine casting on it with no sign of sprue marks.