I find that the small reverse gears are 17 and 18 teeth. That may indeed be correct for your lathe. Or, someone installed a 17 tooth gear when it should have been 18. Check the engagement of the rear gear to the pair of 30 teeth gears. It may be shallow.
16 Pitch 18 Teeth:
Martin S1618 Spur Gear 18T 1/2" Bore No Screw 697950057347 | eBay
Want the back gears? ..........or consider a VFD.
This is a good price:
Martin S1024 Spur Gear 697950056166 | eBay
A little high, make an offer:
Browning NCS1060 Spur Gear 7/8" Rough Bore 6" Pitch Dia. 2-5/8" Hub Dia. NOP | eBay
John
John, thank you for the ebay links. I actually have the back gears, they were just removed for easier access. It appears that both of my small gears are 17T. Is it your opinion that one should be 17 teeth and the other 18 teeth? The back tumble gear actually engages very well. It's the front tumble gear that's questionable. So when my reversing lever is the in down position, the gear engagement seems fine, but when I raise the lever and engage the front gear, that's when it's loud and clunky. I was able to find a Martin S1617 replacement gear from IndustrialZone.com.
Here's a link I'll just need to grind off the extra portion of the hub without gears to fit.
In response to your previous reply, yes I am missing the cross feed selector as well as the gear that engages with the selector knob. I can only assume a previous owner crashed it. The shaft is there (albeit bent), but the gear(s)is missing. Here's a link to a couple of photos of the back of the apron.
Photo 1;
Photo 2
You had mentioned a
few months ago on a previous thread that you may be making some cross feed selectors. If that comes to fruition, please let me know. I may be interested in purchasing parts to get the cross feed working again.
Yes, I would like to create a new backplate and mount a 4 jaw chuck, hence the need for a 7TPI thread. I'll research compound gearing and see if I can better understand my options for setting up the change gears. It's baffling to me that the change gear chart on the lathe calls for a 64 tooth gear on the spindle stud, yet it can't fit due to the diameter.
Once again, thank you for your help and insight. This is all new to me so thank you for your patience and understanding.
Jason