Thread: Video of Zyto running - help with wobble

Have you cleaned the Spindle bore?
Have you put a Dial indicator on your Spindle bore to check if it is running true?
Did you make sure that there was no foriegn material on your adapter sleeves?
How long is the Test bar?
Have you checked the run out at the Spindle end and compared it to the Outboard end?
Is your Tailstock off Vertically or Horizontally?

Thanks for the helpful questions, pipeclay. I have responded in red in the quote below

Originally Posted by pipeclay

Have you cleaned the Spindle bore? Yes
Have you put a Dial indicator on your Spindle bore to check if it is running true? No - what would be the best way to set the DI up to do that?
Did you make sure that there was no foriegn material on your adapter sleeves?I wiped them with kero before inserting
How long is the Test bar? About 150mm
Have you checked the run out at the Spindle end and compared it to the Outboard endNo - how should I go about doing that??
Is your Tailstock off Vertically or Horizontally?Looks mainly horizontal

For checking the bore on the Spindle just place the Tip of the Indicator at the start of the Bore ,turn the Spindle by hand and see if there is any variation.(Dosent matter where you mount your indicator as long as it is secure and dosent move).
If you put your indicator on your test bar closest to the Spindle and take a reading then move it to the far end of your bar and take a reading you should have 2 different figures.
I notice that your Test bar is stepped,you may have to take 4 readings,the first 2 on the Large diameter,measure the diameter of your test bar and also measure the Length of the larger diameter.
If the Bar measured 25mm and was 75mm long and you had a runout of .02 at the Spindle end you would hope to see .06 at the far end, you could then do the same for the Smaller diameter,this is just to see if the runout is uniform,(there is no need for you to do this under power).
You could also do a check on the OD of the Spindle just to check that it is running true.

Thanks for that, pipeclay. The test bar isn't stepped - the step is actually caused by the MT1 - MT2 extension sleeve. However, the point is fair and it might well be worthwhile checking the runout at a few points.

Is it possable to mount the Test bar between centres,this at least will give you an indication of alignment with the Spindle to Tailstock.

I'll give it a go by putting dead centres in both the spindle and the tailstock and winding the tailstock up to the test bar

I can see the MT1:MT2 adapter wobbling. That's a huge amount of overhang from the spindle, and I'll bet the adapter is the culprit. There may be other sources of error, but following your new plan (between centres) is the go.

You can't do an accurate test with an adapter in place....

You really don't need to do this test at all...

How many of us use the taper in the headstock?

I do for some specialised tooling but that is all...It is 99.9% chuck work..

Hi Jeremy,

I have a 1950's S Tyzack & Sons catalog, that has the "Zyto" range of lathes and accessories. (I can scan it if you're interested)

Back to the spindle run-out, take every thing off and just start by measuring the spindle run-out directly at the spindle with a dial test indicator.

For alignment of tailstock headstock, running parallel to the ways, google for...
"Rollies Dad's Method of Lathe Alignment" It's a pretty simple way to get started.

Regards
Ray

Ray
A scan of the relevant pages from the S Tyzack catalogue would be great. I'll PM you with my email address.

Originally Posted by .RC.

You can't do an accurate test with an adapter in place....

You really don't need to do this test at all...

How many of us use the taper in the headstock?

I do for some specialised tooling but that is all...It is 99.9% chuck work..

I do a lot of my work is on MT arbors.

Good news. Very little runout on the spindle! And the tailstock lines up fairly well. When my new tuit (round,) turns up, I'll use Rollie's dad's setup method & then we'll be ready to do some turning!