Cutting Metric threads with Grizzly Lathe

[BOHICAMAN]

I have studied the manual, gone to Grizzly's videos, and asked machinist friends, but no one can tell me what gears to change on the Grizzly G0752 lathe to cut Metric threads. Any assistance would be appreciated!

 

[kyrbz]

There should be a chart on the front of your lathe that specifies what gears you should use and the adjustment of the various levers

 

[kyrbz]

Hypothetically based on the pic I posted, if you wanted to cut threads with a 1.25 pitch, you would have 45 tooth gear in the “a” position, a 40 tooth gear in the “b” position. Additionally you would have the 120, 40, 60, 127 tooth gears set up as shown. You would have one knob (lever) set to the “II” position, and the other set to the “A” position. Set up like this, you would be good to go cutting threads with a 1.25 pitch

 

[BOHICAMAN]

When I followed that chart, the gears didn't match up. I need to cut a M4-0.7 thread. Sorry, your dealing with a novice.

 

[RTM]

Pg 49 of this manual shows the metric chart and what setup is required, but too small for me to read on my phone. It's a download.

Might be 45, 40, II, C , if that chart matches your machines

https://cdn0.grizzly.com/manuals/g0602_m.pdf

 

[kyrbz]

Based on the thread chart for your lathe you should have it set up as follows

The 120, 40, 60, 127 set up as shown. Typically these stay the same for most metric threads.

27 tooth gear in the “a” position
60 tooth gear in the “b” position

Lever set at “lll”
Lever set at “A”

Additionally there is a lash adjustment for the bottom gear shaft. Loosen and pivot it down when changing the gears. When you have the gears you want. Pivot it back up to engage the other gears and tighten

 

[BOHICAMAN]

I'll try that again tomorrow. That's what I did earlier and gears didn't match up. Obviously, I did something wrong!
Thanks, and you folks have a HAPPY NEW YEAR!!

 

[goldtang]

The manual RTM linked has you lathe with a imperial lead screw 12 TPI, so you can’t use the treading dial when cutting metric threads leave the half nuts engaged till the tread is complete you reverse the machine to take the next cuts
it will take practice

 

[ItsNemo]

I'll try that again tomorrow. That's what I did earlier and gears didn't match up. Obviously, I did something wrong!
Thanks, and you folks have a HAPPY NEW YEAR!!

You need to move the gear holders too, they usually slide so you have to mesh the entire stack manually.

 

[BillK]

Do you have the manual ? Here is a link to it on the Grizzly site.

https://cdn0.grizzly.com/manuals/g0602_m.pdf

Page 91-92 has a good clear picture of the metric thread chart and page 46 starts the threading instructions.

 

[alfadan]

Here is a discussion on threading with this model.

Grizzly G0752 lathe

Hi everyone, my 1st post here. I'm having trouble (no luck) threading with this machine. I haven't been able to to get my lathe to repeat the the thread lead on subsequent passes. The mated gears for threading ( #127 & #120 ) have a lot of radial slop to each other, so I'm going to bolt / pin...

www.hobby-machinist.com

Can a die not be used instead?

 

[BOHICAMAN]

Got it!! Thanks all!!! Happy New Year!

 

[dnschmidt]

I'm with Alfadan. For a thread this tiny, if possible, a die makes a hell of a lot more sense to me.

 

[goldtang]

Totally agree, I would use a die to cut the thread , although if some wants to learn I am only too willing to help , learn to grind a piece of high speed steel to the correct angle (60 deg for metric)
then run the thread down till the nut fits and see the smile on the persons face is very satisfying
I am a fitter and machinist by trade and this year I started to transition to retirement so no more work
just play on cars with mates I do feel my trade is dying art, between the govement and industry they don’t want to invest the time and money and this started in the late 80
sorry if this sound feels like a rant
happy new year to you all