Hi everybody
I'm new to this forum and to thread cutting and looking for some advice.
I'm a design student at the royal college of art and I'm trying to make some parts for a machine I'm making.
I'd like to thread some parts, mostly with an ID around 20mm. I'm considering indexable because I can replace the tips easily (although more expensive) when I break them(!) and don't trust my ability to sharpen a carbide tip to 60 degrees.
My buying options at the moment are 6 or 8mm shank sized kits from rdgtools (http://www.rdgtools.co.uk/acatalog/Indexable-Screw-Cutting-Sets.html) or individual tools. I was thinking the kits because they have both internal and external tools and a number of spare tips.
Chronos have separate int and ext kits but in a 16mm shank, too big for what I need to do, I think? (http://www.chronos.ltd.uk/acatalog/Sets_of_16_mm_Square_Indexable_Threading_Tools.html)
I can't afford to wait for 12mm shank kits to come back in at rdg, arceurotrade or chronos and at the moment would obviously rather spend a bit less.
Is it a false economy to buy a set rather than individual tools?
Does the shank of the tool holder (8mm vs 10 or 12mm) make such a big difference?
Does the type of tip make a huge difference? Generic A60, G60 vs pitch specific tips?
Unfortunately I can't really afford to make a mistake in terms of time or money just now, with the final exam and show rushing towards me.
I have a 1964 Boxford AUD, which I bought from the college a couple of months ago. It was being scrapped because laterly it had been in the wood workshop for 10-15 years where they just hadn't had the time to maintain it. It was still just about working but needed a lot of tlc because it was totally clogged up with wood dust. I stripped it down, cleaned, oiled, unseized it, changed belt etc and it now seems to be working fine. Well enough for what I need to do at the moment.
So this leads to my second question. The lathe came with a burnerd 3 inch chuck with only the external jaws. I'm finding now that it's a bit small for what I need to do. Chronos has a vertex 100mm chuck but would prefer bigger.
Does anybody have any experience mounting a 130mm chuck on an AUDII for instance? Does it actually go on?
Do I have to take the weight of the chuck into consideration and how will this affect the spindle and bearings? Will it wear them out, or mean that I have to do even smaller cuts?
Would it be better to got the 100mm vertex chuck or even one of the other ones: Sharp, Soba, Turntech, generic?
I'm fairly new to this so apologies for so many questions and if I've left out a ton of information.
Many thanks in advance
Mo