Replacement Change Gears for 12” Geared-head Lathe

[Paul Jones]

To: Y-Geo,
I was introduced to the Dart LUBE CMD Extreme Pressure Lubricant from a recent YouTube video by Keith Fenner. He mentioned that his tube of the lubricant was probably his second tube in a lifetime of machining because it is used very sparingly. Instead of paying $9.05 USD you might have to pay $20 USD with shipping but it is not going to brake the bank when it lasts practically a lifetime.

To: LMMasterMariner,

Thanks for the tip on buying from aliexpress for 1.5 module gears.

I bought my spur gears based on the YA series from the company Boston Gear instead of buying from Grizzly because the gears from Grizzly did not fit my lathe (Grizzly had 14.5 degree pressure angle and I required 20 degree PA). My gear head, gap bed lathe was built in Taiwan in 1987 but I discovered it has some Imperial dimensioned parts including the gears while the shaft diameters are exactly metric (some 18 mm). At first I though the gears were based on 1.5 module gears because I thought a lathe built in Taiwan would be basically all metric. After careful measurements of the existing gears, I determined the gears were actually 20 degree PA with a diametral pitch of 20. The gears sold by Boston Gear are USA made and very high quality. Instead of buying directly from Boston Gear, I searched eBay, found the exact Boston Gear gears I needed, made a fair offer and purchased the gears from new stock for $20 USD each with shipping. I still had to machine the hub and tooth widths to be smaller and broach the gears using this method ( http://www.homemadetools.net/forum/b...7110#post23249 ) because I did not own a 5 mm wide broach.

Thank you for the information.

Paul