9×19 / 9×20 lathe gearing

[Jayme GisbourneParticipant @jaymegisbourne80009]

I know these are made by many makers such as Enco, Grizzly, Jet ect. I’m picking one up this Sunday and I need to make sure it’s not missing any gears. So are both the metric and screw cutting change gears all self contained in the back and you just swap them around or are some meant kept lose in a tool box or cabinet outside of the machine and you swap them over for the gears inside to get the pitch? And how many should be with the lathe including the ones in the back by the belts? This will be my first personal lathe and it’s my worst nightmare to had over all that cash and be missing a few gears.

Any information would be much appreciated, thank you and I hope you’re all doing well.

[Jayme GisbourneParticipant @jaymegisbourne80009]

I need information on the gears that come with the 9×20 lathes

[Andy StopfordParticipant @andystopford50521]

Assuming it doesn't have a screwcutting gearbox, you'll need some extra changewheels – the gear train at the left hand end of the machine is likely set up to give a fine feed rather than for screwcutting.

Which changewheels you need depend on what threads you wish to cut, but the following link lists a typical selection:

https://www.arceurotrade.co.uk/Catalogue/Machine-Spares/SC3-Mini-Lathe-Spares/Super-C3-Change-Gears

To learn more, see these articles:

http://www.lathes.co.uk/latheparts/page6.html

http://www.lathes.co.uk/latheparts/page14.html

[Mike Woods 1Participant @mikewoods1]

What make and model is the lathe you are getting? Some user manuals are available on-line for this family of lathes, for example Grizzly have a link to one for the G4000. The parts list gives a good idea of what is normally provided.

[Andrew TinsleyParticipant @andrewtinsley63637]

All of the generic 920 lathes have a screw cutting gear box. I can't get at one to check the other gears, but there are surprisingly few.

Join the 920 group at groups IO. Well worth it for the info, There are various write ups on the net about upgrading the 9×20 lathes. They are a bit rough, but can be improved to a reasonable lathe if you work at it.

Andrew.

[BazyleParticipant @bazyle]

The screw cutting gearbox is limited and needs extra gears. Bigger lathes have a second lever to give powers of two but smaller lathes provide that by changing gears. Metric lathes may have more changes needed.
see this manual, fig 60 for some guidance and the inventory fig 3 shows the extra gears.

[Jayme GisbourneParticipant @jaymegisbourne80009]

Thank you the manual did help. It seems I need 9 change gears including a 120 and 127 tooth gear? And what is this groups IO?

[Jayme GisbourneParticipant @jaymegisbourne80009]

I’ve also heard people use both 5m710 and 5m730 belts and heard even thought the 918/920 lathes look the same they can take different parts and belts? What belts do you guys use and are all the gears kept in the headstock?

[Ron LadenParticipant @ronladen17547]

I have the Warco 918 which is 9×20 as you say they come in a number of names and model numbers but all are basically the same lathe.

There are 7 gears in the headstock, (6 metal and 1 nylon) plus another 6 steel gears loose.

The manuals list the drive belt as a 5M 710 but I find that too tight so I use a 5M 730 and with the tensioner pulley/lever correctly adjusted and set up its fine.

Do you know if the lathe you are getting has any mods/improvements? as Andrew mentioned there are a number that can be made and there is a wealth of information out there. Good luck with it.

p.s. I ran a thread on mine which has some pictures and a bit of video which may be of interest/help. It's in Workshop Tools and Tooling titled My new lathe a Warco 918.

Edited By Ron Laden on 29/04/2020 06:10:26

[Thor 🇳🇴Participant @thor]

Posted by Jayme Gisbourne on 29/04/2020 00:18:44:

……… And what is this groups IO?

Link to the 920 lathe group.

Thor

[Andrew TinsleyParticipant @andrewtinsley63637]

Thanks Thor

I must learn to do links! Something that I always intend but never get around to.

Andrew.

[Jayme GisbourneParticipant @jaymegisbourne80009]

I’m not sure about mods as there’s not a lot of pictures. So it should have 7 lose gears with it? Thank you

[Jayme GisbourneParticipant @jaymegisbourne80009]

6 lose gears sorry *

[Russell EberhardtParticipant @russelleberhardt48058]

Don't worry if you have a gear or two missing. They are easy make if you have access to a 3D printer. See here

I've been using a gear printed in PLA for about a year now on my slightly bigger lathe with no problems. It makes a quieter machine.

Russell

[Jayme GisbourneParticipant @jaymegisbourne80009]

You guys have made my week. All this information is much appreciated thank you. I have a 3D printer (Makerbot) at work but apart from someone testing it it’s never been used nor have I any experience on it. Maybe it could be a starting point. Thank you so much guys. I hope everyone one is doing well

[Howard LewisParticipant @howardlewis46836]

The gears are likely to be Module ones.

You can work out the Module of the gears by taking one, counting then teeth and measuring the OD.

So a 1 Mod gear with 80 teeth would have an OD of 82 mm., a 1.25 Mod would be 100 mm

a 1.5 Mod would be 120 mm OD

OD + (N + 2  ) x Mod

If there is room, a 127T should allow you to cut Imperial threads, if the Leadscrew is Metric pitch, or vice versa.

This should help you in making any that you need.

Howard 

Imojis!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Edited By Howard Lewis on 29/04/2020 18:33:17

[Jayme GisbourneParticipant @jaymegisbourne80009]

Thank you Howard as I know nothing about gearing. I’ve been using lathes since a young teenager but until now I’ve never got down to the nitty gritty of it

[Howard LewisParticipant @howardlewis46836]

Sorry Jayme,

The "+" in the formula should be a "="

OD = (N+2 ) x Mod.

held down the shift key too long. Reactions are slow with age!

Howard

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