G0709 lathe question?

Mike8623

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Is there a way to get a slower feed rate on my carriage than is listed on the plate? Has anyone done this before and if so how?
 
are you using the half nuts or using the feed select lever?
using the longitudinal feed select lever is the slowest/finest feed available without changing gearing

according to the manual the machine is capable of .00168" per revolution as the finest feed
 
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Have you checked that your change gears are correct per the chart, I wouldn't want to feed any slower than 0.00168" per revolution which is the lowest setting (FATX1). Looking at the change gears, "F" gear setup yields the lowest feed rate with the gears provided. Any slower feed and you end up rubbing the metal as opposed to cutting it.
 
Is there a way to get a slower feed rate on my carriage than is listed on the plate? Has anyone done this before and if so how?

If you want the feed rate to be slower, change out the back gears from the spindle to the drive.
 
I am wanting to drill a few rifle barrels and would like the lathe to feed slower with the feed lever engaged. Can it be geared down any lower, thus resulting in a slower feed? If it can what gears would you recommend? I would like to go slower than .00168
 
now you are talking about making or installing a larger drive gear for the transmission.
for example my shenwai 1236 has a 40 tooth gear drive gear on the transmission
by the example,
you'd need a gear with more than 40 teeth in order to slow the transmission to achieve the reduction you desire
i'm not sure exactly how slow you wish to go, but you could try a 45, or possibly a 50 tooth with the parameters listed above.

without having the actual transmission tooth counts,
computation of the gear split would be challenging as well as speculative on my part
 
Between change gears and the QCGB, there are a lot of potential gear combinations left out of the chart, but the F change gear combination is not merely the slowest on the chart, but also the slowest you can get with the included change gears. I don't know the change gear tooth specification for the G0709 but would be interested to find out.
 
The manual provide the tooth count for the gears, the "F" arrangement" which is the maximum reduction, given the available gears there are no other combinations that will give you a lower feed. Due to the arrangement of gears, even if you could cut new gears, I do not think there is arrangement which you would work because of interference either with other gears or the case cover. So maybe instead of the 32 drive gear you could use something like a 24 tooth which would give a 25% speed reduction. If you know the gear and shaft specifics, you may be able to get a gear for another lathe and/or modify one. I am also not sure that even with such a gear thay you would have enough adjustment range for the other gears, you would need to do some mockup to see if it is even feasible. See below.
 
I have created a google spreadsheet where I'm trying to fill in configurations not on the chart on the front, at least for my 2014-vintage G0709. It's not really useful for you in this case, though, except if you want confirmation that there's no slower combination of gears available through the QCGB.

I haven't validated it at all yet; so far it's only math. I'm just working from existing ratios and extending from the chart.
 
I have created a google spreadsheet where I'm trying to fill in configurations not on the chart on the front, at least for my 2014-vintage G0709. It's not really useful for you in this case, though, except if you want confirmation that there's no slower combination of gears available through the QCGB.

I haven't validated it at all yet; so far it's only math. I'm just working from existing ratios and extending from the chart.
Thanks for the spreadsheet! I've been looking at some oddball threading that between some of the current selections. Your spreadsheet will help with the gear combos and new gears I'll need to cut to hit the numbers.

Bruce
 
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