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Member postings for andrew lyner

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

Thread: Boring bar size
08/09/2018 12:09:07

I'm not holding the bar in a drill chuck. The drill size seems to be what limits the size of the initial hole (at least I though it did. But perhaps that's nonsense and it isn't necessary to have a pilot hole. That could explain a lot!

08/09/2018 12:00:00

I have a mini lathe with a drill chuck that will hold a 13mm max drill. I want to buy a boring bar that is as robust as possible. If I get a 10mm bar, what size of insert can I use, to ensure clearance at the start of the cutting? I want to avoid needing to do the job in steps - using a smaller bare to start with.

The spec of these tools is a bit bewildering - with a whole list of numbers and letters, describing them. My data book gives a sort of translation but I would appreciate some direct advice.

I will be working with aluminium so am I right in assuming that the right tip would be essential? (Dumb question. probably) From what I can see, the way that the dimensions of the cutter are described with those letters, sort of makes sense, with a high clearance angle for aluminium. I guess that it will all come clear with experience.

Thread: Warco Super mini lathe tool post
04/09/2018 22:45:47
Posted by Nick Clarke 3 on 04/09/2018 20:32:48:
Posted by andrew lyner on 04/09/2018 19:20:33:
Posted by not done it yet on 04/09/2018 17:04:54:

An alternative could have been to use tubing, rather than bar. I really need a cupboard full of off-cuts; I haven't located a suitable scrap metal merchant near my new home. There was a brilliant place in Brighton that would sell useful stuff at really good prices. eBay is not a cheap source of bits and bobs,

With all due regard to your personal privacy, what general area of the country are you in? Perhaps someone could make a suggestion?

My personal experience is that metal merchants (as against model engineering suppliers) keep offcuts and usually, if you have bought something, will sell these to you at scrap prices as that is all they will get for them.

I live in Essex / London borders and I have not traced a suitable source from some time spent on Google. When I lived in Brighton, things were very different. Random Stainless bits for my boat could sometimes be had at scrap prices. Any info would be very welcome. smiley

04/09/2018 19:20:33
Posted by not done it yet on 04/09/2018 17:04:54:

Here is an alternative to parting off a 50mm aluminium bar - cut with a hacksaw.smiley Unless you have a disability, of course.

I did consider that but the filter holder is very thin and I doubted that I could finish of the mangled face. Turned out fine though, as it happened. I can't help thinking that a different parting tool holder would help - or even a design that could fit the Warco post.

An alternative could have been to use tubing, rather than bar. I really need a cupboard full of off-cuts; I haven't located a suitable scrap metal merchant near my new home. There was a brilliant place in Brighton that would sell useful stuff at really good prices. eBay is not a cheap source of bits and bobs,

04/09/2018 16:08:57

Thanks for yet another useful set of comments, chaps. I think I may well go for the Warco low cost post.

Incidentally, I just found a limitation to my new Mini when trying to part off a 50mm aluminium bar. I managed it by lengthening the parting blade a bit at a time. There was some chatter and some clogging / stalling but I managed to tame it by adjusting side clearances and position and frequent clearing of swarf. I was on tenterhooks as the cut got deeper and deeper but the work fell off with a satisfying plop.

This was with the standard four position tool post. I guess you will all say that it's not a good thing to try and I'd agree but I needed a 47mm 0.75mm male thread for an optical filter so I couldn't think of any other way round it.

03/09/2018 22:30:42

"and of course the fact that tool changing isn't tool free."

Ah yes. Pictures of other posts show a lever. That could be an advantage.

03/09/2018 17:12:29

I have recently started using my new super mini lathe and I am pretty impressed with it on the whole. The tool post is not too convenient to use and I have been considering getting a Quick Change version. Warco offer a low cost QC post and I was wondering how it is likely to compare with the other one or two that seem to be available at similar cost.

Does anyone have experience of the Warco post, compared with others?

Thread: Using gears for odd size threads
26/08/2018 10:27:33

Thanks so much guys. That was just the info I needed. I can do arithmetic with the best of them but 'you never know' about what goes on inside. I tried counting the gear teeth in the box but I went into Ratio Overdrive. The numbers in the Table gave me a strong message and you confirmed it.

@Alan Vos I appreciated the caveat about the actual choice of wheels and the fact that some combinations may not fit

"Pitch tables cover the most common/popular options. 0.75, while easy to achive, is less common (M4.5 or fine)." This an odd requirement for a thread on a 2" telescope filter barrel.

I was looking for a suitable handbook so I may go for that recommendation.


25/08/2018 14:46:07


I just bought a Warco Super Mini Lathe and I am pretty pleased with it - it looks and works a lot like its big brothers. I am sure that its inadequacies can be pointed out by experienced machinists but it is what it is.

My question is about thread cutting. I need a 0.75mm pitch but the table on the gear cover doesn't include it as an option. I have a good selection of gears supplied and I was working out how to use what I have to modify the threads shown on the table.

Can it be this easy? A 1.5mm thread uses A40 B60 C60 D40 and that seems to imply the lead screw is 1.5mm pitch (?). To get a 0.75mm thread, it looks like I could replace C with a 30 wheel. From the diagram it seems that B and C are keyed together or a single wheel can be used on that shaft.

Any comments welcome.


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