- Joined
- Apr 20, 2011
- Messages
- 430
Am deep into the rebuild of my "new" 10L (1944!) and probably as should be expected, there are some very worn parts. The gear box and the gear train down to it had some pretty bad spots. The 2 reversing gears and the big gear that was driven off them, and the gear running off the selector handle on the box (this one was more like a bicycle sprocket than a gear!!) Also the boxes 2 main gear shafts that have bushings on one end and just the housing on the other were worn badly with out bushes, so I had to bore the housing out and press in 2 oilite bronze bushes.
A couple pics of the gear cutting - I wanted to encourage those of you that might be faced with badly worn gears and being fearful of cutting them in your shop. As a still learning wannabe machinist, I found "gearcutting" to be a daunting subject, and it is indeed a very deep subject, but for doing this type of making up a gear, it is much less involved, and with a lathe, mill and a dividing head is relatively simple. You will be simply duplicating an already existing formula for the teeth, dimensions, etc.
A tip on counting teeth - using a small tipped magic marker, put a long slash mark for the starting point and then tick off every 5 teeth with a small mark...
With access to this, and the many other forums, - and google and youtube! the means to teach yourself how is readily available. I got my feet wet by making a complete 10 gear metric change set for the Emco Compact 10 I was rebuilding - I only messed up 4 blanks, and they were of smaller gears - (metric was fun!)
This is the 2 reverse gears ganged in the dividing head cutting the 28 teeth. Replacing the original cast iron gears with steel wasnt gonna ride too well as steel on steel, so I also pressed in oilite bushes on the new gear blanks (the 4 gears were made from whatever was in the scrap box - probably 1018) ...
This is the new reverse gears mounted on new turned up shafts on the reverse lever, the shifter handle 27t gear mounted, and the large 64t gear blank mounted on its mandrel ready to go in the dividing head, the old gears are in the pic too.
A couple pics of the gear cutting - I wanted to encourage those of you that might be faced with badly worn gears and being fearful of cutting them in your shop. As a still learning wannabe machinist, I found "gearcutting" to be a daunting subject, and it is indeed a very deep subject, but for doing this type of making up a gear, it is much less involved, and with a lathe, mill and a dividing head is relatively simple. You will be simply duplicating an already existing formula for the teeth, dimensions, etc.
A tip on counting teeth - using a small tipped magic marker, put a long slash mark for the starting point and then tick off every 5 teeth with a small mark...
With access to this, and the many other forums, - and google and youtube! the means to teach yourself how is readily available. I got my feet wet by making a complete 10 gear metric change set for the Emco Compact 10 I was rebuilding - I only messed up 4 blanks, and they were of smaller gears - (metric was fun!)
This is the 2 reverse gears ganged in the dividing head cutting the 28 teeth. Replacing the original cast iron gears with steel wasnt gonna ride too well as steel on steel, so I also pressed in oilite bushes on the new gear blanks (the 4 gears were made from whatever was in the scrap box - probably 1018) ...
This is the new reverse gears mounted on new turned up shafts on the reverse lever, the shifter handle 27t gear mounted, and the large 64t gear blank mounted on its mandrel ready to go in the dividing head, the old gears are in the pic too.