Thank you for all the ideas you post.
I am unaware and have no knowledge of the lathe you have. But just a word of warning plastic gears or Tufnell gears are used in gear trains as a safety point for the machine. (Please forgive if I am incorrect in this case of your machine) The reason for having a plastic or Tufnell gear is like a fuse in a plug. It protects the machine in case of a jam up/overload. The plastic gear is the weak point in the system and the teeth can shear and protect the more expensive items like the gear box/headstock. I hope you are not offended by this observation
Thank you again for all the ideas you post
The Home Engineer
Thanks for sharing! I second that safety note, on my lathe my motor is belt driven so a crash results in the belt slipping. A gear driven lathe might cause some damage if all the parts are "hard", having said that it might be possible to build a overload sensor that would trip quickly if there is a crash to retain some safety. Hope that makes sense.
P.S. i think the capt is fine, looks like he is just making an aluminium copy of a steel gear.
I really like Cap's upgrade.
I find that plastic gears when used in machinery are done so for several reasons Economics probably nearing the top of the list in most cases. Another reason might be for smoother quieter running especially where spur gears are concerned, engineered obsolescence would also be a huge factor to some manufactures. But being designed to fail in event of crashing would probably be rated very low on any manufactures list. At least a reputable manufacture, since such a failure would usually cause more damage to other gears requiring the replacement of several gears. installing soft keys shear pins and torque limiters at time of manufacture are both simple and economically sound procedures.
But that is just my opinion.
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