Chester 920

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Chester 920

This topic has 17 replies, 8 voices, and was last updated 14 August 2014 at 01:12 by Ady1.

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13 August 2014 at 15:42 #160590
Jon Harrison 2
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@jonharrison2
I just got my new / old Chester 920 in yesterday. I have the manufacturers manual but it's fairly basic.

Manually, motor off – The leadscrew can be rotated and turns the gearbox engaging the gear shift when raised. This then drives the bottom gear on the shaft end and it in turn drives the double mounted gear above.

There it ends. The double gear isn't meshing with the gear above, in fact it's several mm away from it.

Questions:-

1) Gear shift won't slide sideways. Should this be easy to move or may the spindle need cleaning and oiling as it may not have been used for some time?

2) Gear meshing:- Not sure what's going on there. are both sets fixed or is one spring tensioned to automatically mesh? If so perhaps needs a good clean all round.

3) while asking, should all gears be tight on the shaft or have some vertical back and fore play. If necessary, can the play be taken out and if so, how?

4) Is there some publication will give me more information than the basic manual?

My thanks
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13 August 2014 at 15:42 #17467
Jon Harrison 2
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@jonharrison2
Engaging automatic feed – a gearing issue
13 August 2014 at 16:45 #160594
Jon Harrison 2
Participant
@jonharrison2
I've managed to resolve 1 and 2 above.

1) the cover comes off easily to reveal the gearbox. Basically dry from lack of use. A polish up and grease has sorted that out.

2) the lower gears are on an arm which can be dropped to disengage continuous feed. A quick repositioning and all is meshing fine.

another question

The rpm is very slow. I tried fathoming the chart but it's not translating logically for me. I think I need to be up about 180-250 rpm for steel. How do I view the chart so as it makes sense?
13 August 2014 at 17:03 #160596
Bazyle
Participant
@bazyle
Hello Jon,

The arm you mentioned is called the 'banjo' because some of them are sort of banjo shaped. You will need to move it occasionally to put different gears on for different threads.

Clean off the grease again and only use light oil on these gears as grease picks up swarf and createsa grinding paste.
13 August 2014 at 17:13 #160598
Thor 🇳🇴
Participant
@thor
Hi Jon,

May be this site will give you some help, it has some pictures of the drivetrain (and installation of a DC motor). There is a timing belt from the motor to a countershaft, and a small/narrow V-belt from the countershaft to the spindlepulley for low speeds. Move the small/narrow V-belt to go from motor to spindlepulley for high speeds.

Have you joined the 9x20lathe group on Yahoo?

Thor

Edited By Thor on 13/08/2014 17:15:58
13 August 2014 at 17:49 #160599
Jon Harrison 2
Participant
@jonharrison2
Thank you fellas

Not got any further than starting to clean off the grime and resolve immediate and obvious issues. I did wonder about moving the belt but had also read about their cost if I accidentally snapped one.

One thing's for sure it's one hell of a lot better than my Clarke was. It has also has had some wood turning activity by the few chippings and dust that's about. That probably won't help any lubricants.

This one plated up for December 1998. So is it actually an Enco or a Chester? Pardon my ignorance, but what is a 9×20?

Re the sloppy gears. Can't tighten the screws more but one or two washers are still free moving. Might be resolved by replacing the washers unless they've been like that too long and damaged the gear on the spindles.

I'll look up the 9x20lathe group on Yahoo

My thanks
13 August 2014 at 17:59 #160601
Jon Harrison 2
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@jonharrison2
Went to have a look at the group but the signup wants all sorts of details I refuse to give out on line. So no go unless I get desperate.
13 August 2014 at 18:03 #160603
Thor 🇳🇴
Participant
@thor
Hi Jon,

9×20 means 9 inch swing (max) and 20 inches between centers (max), it is the "american way". I have sent you a PM.

Thor

Edited By Thor on 13/08/2014 18:13:22
13 August 2014 at 18:43 #160604
Howard Lewis
Participant
@howardlewis46836
When you are swinging the banjo about, and moving the gear spindles, to get a decent mesh between each pair of gears, roll a piece of paper through the mesh as you tighten the fixings. This should give about 0.003 thou (inch) of backlash, depending on the thickness of the paper.

After final tightening, recheck for backlash on each mesh.

Running gears without backlash will result in noise and wear to the gears and bearings.

Excess backlash will not help accuracy (could even cause chatter when using power feed) and will cause problems when screwcutting.

Gears can be lubricated with grease or one of the specialised gear lubricants.

Good Luck with your new toy!

Howard
13 August 2014 at 19:26 #160608
Vic
Participant
@vic
Jon, go to the Grizzly tools (USA) website and download their operation manual and parts list for the 920.

Their manuals are far better than most vendors.
13 August 2014 at 19:30 #160609
Jon Harrison 2
Participant
@jonharrison2
Thank you everyone

Think I'm getting there. Swapped the belt to a different setting and it looked over fast so not sure to get the speed I want with the belt or the gears.

Did find this though **LINK**

So when they eventually allow me to post it might be the environ for more questions.

My thanks
13 August 2014 at 19:36 #160610
Les Jones 1
Participant
@lesjones1
Hi Jon,
The gears do not have any effect on the spindle speed. They effect how much the carriage moves for every revolution of the spindle.

Les.
13 August 2014 at 19:49 #160616
Jon Harrison 2
Participant
@jonharrison2
Right, my mistake. Bit of a crash course on this lathe after the vari speed Clarke.

Had a look at Grizzly but couldn't find a 920 or am I looking for the wrong thing or a specific Brand & code?
13 August 2014 at 20:03 #160619
Les Jones 1
Participant
@lesjones1
Hi Jon,
You might find this site useful.

Les.
13 August 2014 at 20:06 #160623
Keith Long
Participant
@keithlong89920
Jon

I think the manual you want on the Grizzly site is labelled "G4000". Grizzly list the machine as a 9×19 for some reason, but I'm pretty sure that the G4000 manual is the one linked to from the Steve Bedair site.

Edited By Keith Long on 13/08/2014 20:07:04
13 August 2014 at 20:16 #160625
Jon Harrison 2
Participant
@jonharrison2
Got it

Yes far superior manual to the Chester version. Saved it as not printing off 70+ pages tonight, just the relevant section for the morning's adjustments.

Really appreciate the help
13 August 2014 at 21:01 #160628
Vic
Participant
@vic
Glad you're sorted Jon. I have a Warco VMC but refer to the manual for the Grizzly version!
14 August 2014 at 01:12 #160640
Ady1
Participant
@ady1
A polish up and grease

Don't use grease, use oil. Any oil, motor oil. but don't use grease unless you are told to
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