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Home Workshop > General Area > General > Screw cutting on Bantam lathe?

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Screw cutting on Bantam lathe?

Screw cutting on Bantam lathe?

Have a 1600 Bantam which has been fitted with single phase motor and dont seem to be able to make it reverse for screw cutting? Wonder if there is anyone close to me (Southampton) who would be able to sort the reversing problem for me and go through some basics regards screw cutting?  I think there is some sort of solid state switch available to sort the reversing issue, but pretty clueless about electrics and would much rather pay someone to do a proper job than mess around with it myself and very likely get little forward progress.  TIA for any replies.

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Re: Screw cutting on Bantam lathe?

Usually pretty simple. A photo of the motor plus conection plate would help.

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Re: Screw cutting on Bantam lathe?

Thanks Pete I will do that tomorrow.  Watched a YT video where someone sucssfully cut threads by marking lead screw, chuck and saddle, rather than reversing machine, and wonder if that might work?

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Re: Screw cutting on Bantam lathe?

Chris. What you need to know about single phase motors is that they are happy going anticlock or clockwise once they have been "started".  To start a single phase motor  there are several methods  but this normally involves a start winding so when you apply voltage it energises the sratrt winding to get the motor rotating then the main windings take over some times by a centrifugal switch, the key to reversing a motor is to change the direction of current flow in the start winding. If  motor has a capacitor start sometimes all that is required is to reverse the current from the capacitor. I know this is all a bit simplistic but these thoughts helped me sort out a dewhurst switch on a single phase motor.  Incidentally you do not need start windings on a small 3 phase motor they can self start.  A motor will need to stop completely before it can be reveresed.  There are two good books on electric motors by Jim Cox , Electric Motors and Electric Motors in the Home Workshop Amazon list them with Amazon Prime you will have them tomorrow!
Cutting metric threads by reversing the lathe is a bit time consuming it does work well, but if you can visualise the process you are better working from the headstock to the tail stock this essentailly solves the stopping in the correct place problem and allows you to run the lathe a bit quicker useful for tipped tooling. I have tried this by mounting the cutting tool  in place of the parting tool at the rear of the crosslide, you may not have a parting tool holder, but it's well worth investing.  As an aside I have cut a left hand thread by mistake  as I said it takes some mental agility that sometimes I'm lacking.
Ashley

Ashley (Remap Volunteer look us up  www.remap.org.uk  The best volunteering opportunity for practical people)

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Re: Screw cutting on Bantam lathe?

A simple rule is - if the spindle and screw are turning the same direction you'll cut a RH thread. If they are turning opposite it'll be a LH thread.

Did you get a photo of the motor Chris?

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Re: Screw cutting on Bantam lathe?

I don't know the Colchester Bantam, but as a general rule be careful with reversing the spindle and cutting towards the tailstock if the chuck fitting is a plain thread on the spindle nose...

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Re: Screw cutting on Bantam lathe?

Bantam has D13 chuck fitting.............so thats not a problem

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Re: Screw cutting on Bantam lathe?

I have a Bantam 1600 with a twin speed motor and reverse but I DONT ever use the reverse,
simply no need to

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Re: Screw cutting on Bantam lathe?

Piero Franchi wrote:

I have a Bantam 1600 with a twin speed motor and reverse but I DONT ever use the reverse,
simply no need to

Be very interested to hear if you can cut metric threads if your machine has imperial lead screw without reversing?

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Re: Screw cutting on Bantam lathe?

No mention of wanting to cut metric thread

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Re: Screw cutting on Bantam lathe?

Metric threads on lathe with imperial leadscrew seem only possible with reversing the machine. Lots of YT videos which suggest otherwise but none of the methods shown there seem to work?

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Re: Screw cutting on Bantam lathe?

But who has said this guy is trying to cut metric????

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Re: Screw cutting on Bantam lathe?

If I was wanting to cut imperial no need to reverse as I have imperial lead screw and threading dial. Its all very well explained in Colchester manual, and obviously no need to reverse. Thanks for your comments anyway.

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Re: Screw cutting on Bantam lathe?

Chris
It would have made things a lot easier if you had mentioned you wanted to cut a metric thread.

Ok  so why not simply turn the lathe in reverse by hand

Its been done before

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Re: Screw cutting on Bantam lathe?

Reversing by hand is intensely tedious though. Reversing the spindle is the commonly accepted method. If you want to cut metric and imperial threads without reversing find something like a Hardinge - they can do it without even stopping the motor.

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Re: Screw cutting on Bantam lathe?

Pete I would very much like a Hardinge but the Bantam works fine for nearly everything I want to do, and with the kind help of someone from this forum I know pretty much exactly how to wire it to run in reverse, just need to find time to get it done.  Got an old Arbroga mill/drill to sort out now as well, which hopefully wont be that involved to do.........

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Re: Screw cutting on Bantam lathe?

That's great. Once you#ve got over the initial nerves of threading with the nuts closed you'll find it a breeze.

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Re: Screw cutting on Bantam lathe?

Pete a mate of mine has made a few threaded parts for me and he makes it look very very easy. It does help he has been doing threads for 40 years though and has a threading dial with changeable gear wheels  which picks up on the lead screw so no need to mess around with reversing. Interesting that all engineers have different ways of doing things though as someone else I know who is old school and runs a business making pistons, and suggests alternative methods.

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Re: Screw cutting on Bantam lathe?

The inter-changable gear wheels are for using a threading dial on a machine with a metric leadscrew. They don't help with threading metric on an imperial machine, unfortunately.

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Re: Screw cutting on Bantam lathe?

Gear wheels changed for different pitches of metric then I guess Pete?

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