Member postings for Ian Skeldon 2

Aagghhhh I think something is wrong here, I have a tumbler driving a 70T, driving a 80T with a 120T on the same shaft (a) driving the 40T on the feed screw gear box (b), I have selected position 9 on the gear box and a scratch test shows about 24/25 tpi.

Is there something obvious I am missing or is it possible that the label stuck on the machine is the wrong one. Right now any ideas are very welcome.

Please see diagram below showing the number of teeth on that given position.,

Thanks, Ian

Thor and Vic thank you, very interesting. The actual item is not like the image I had in mind and looks very simple with muliple uses.

Thank you.

Ian

I have seen tagential tool holders mentioned several times recently, can I ask exactly what is a tangential tool holder, where do you get them from what are the advantages/disadvantages of using one?

Managed to spot the mistake, I need the gearbox selector in position 9, not 1, doh.....

Hi Michael,

The 120 tooth gear that came supplied does fit, but only just, it's a fiddle to get it on. Having said that, I think I have got it wrong. I have cut a test thread (external) and am getting about 22 tpi. I have uploaded a photo showing the new gearing. Red gears unchanged, other gears shown and numbered, any ideas what have I got wrong?

Thanks,

Ian

Well sorted Ian, any links to the chuck that you bought in case others need to go down the same route?

Hi Howard,

your point is very valid, I could buy a metal 127 tooth wheel of ebay (is it ok to mention it by name?), if the exact spindle bore size is not available I would prefer one that is smaller and then bore it out and add a key way, I don't fancy making a bush of maybe 1/32" or whatever but could do so if really needed.

I don't know Mike, or even had any dealings with him, but it sounds like a sad loss for all of us using this great forum. RIP Mike.

Well teeth counted, 120 as first thought, I have ground the six down and I think it has been stamped twice, once with a 6 and then again with a 0 ?

I will try the 120 to 40 gearing a go. Thanks again.

Ian

Les and Martin thank you, I will count the teeth on that gear and let you know the outcome but now cleaned up, it is definitely stamped 126, strange I agree, but with chinese machinery, who knows ?

Am I right in thinking that if I put the 126 tooth wheel on 'A' and the 70 tooth wheel on 'B' I can cut a thread with 1.8 pitch, which is very close to the 1.82 required?

If not, I have got something wrong in my understanding of the ratios and this is also quite likely !

This is the back end of my DB10,

Hi Jason, Hi Michael,

Yes I have downloaded the chart for gear ratios and that will be very useful ( Thank you Martin ). Well for now I have decided that the lathe stays as it is good in all other respects.

I do have a 3d printer and could give printing a gear a good go, as mentioned by Jason I could possibly reduce the od slightly and still acheive good meshing.

I have also decided to buy a set of 5/8 bsp taps from tracy tools to do the immediate job in hand.

Finally I have to say that I am extremely impressed at the fantastic help offered from forum members and hope that I will be in a position to help others out at some point.

Thanks Jason,

Must admit I have been busy measuring diameters (ID and OD) just to see if there is a wheel from something else that would fit on my lathe.

For some reason my lathe didn't come with a 127 tooth wheel, although it's a cracking lathe and cuts very true I think it's days in my workshop are now numbered.

I extended the bore depth beyond the required depth of threaded portion so that I could cut conventionally (travelling towards the chuck) safely. However I have had to abandon the idea of cutting the thread on the lathe as I can't produce a 5/8" bsp on my metric lathe.

But I am very grateful for all the advice offered.

Thanks, Ian

Firstly Martin, thank you for your kind comments in an earlier post, I am always happy to help where I can.

Patryk, I think you have somewhat under estimated the response to your original question. You clearly state that you have little or no experience and ask for advice. The advice streams in with a large majority of that indicating that a seig would be a good place to start, you seem determined to ignore the advice you asked for so what exactly do you want, the cheapest out there on the internet? Just some particular colour scheme? A second hand one that you will not have the skills to check over properly? Something that you can buy and leave enough money to buy cutting tools and a good quality vice and/or clamping set?

I have no connections with any of the suppliers listed or mentioned within this thread, but I know which way I would go after asking the contributors for help.

Anything by Zinc Alloy and the hidden riders of tomorrow (later to become tyranosaurus rex, then T Rex)

Slip sliding away by Paul Simon

One good turn by Al Jarreau

One good turn deserves another by Mark Colby

Industrial Disease by Dire Straights

Hi Martin,

It might fit, if it were available but it would be very tight. In fact just checked and my 120 tooth gear looks like it could be a 126 tooth gear with poor stamping of the numbers !

haha what a cock up, your right it is 5/8"bsp, I just copied 1/2 bsp through in replying to redsetter, love the humour Andrew.

Thanks Jason, duely noted. To be honest I could do with a more capable lathe and a M300 seems to be a good compromise between cost, size and ability. Spindle bore is also a consideration as this has stopped a few projects in it's tracks.