EMCO Compact 8 Gears files

[Fermic]

Hi everyone,

I modeled my missing gears for my Emco Compact 8 lathe. Wanting to save my wallet from buying the metal version of gears.

They'll have be reamed to the 14 mm, preferably this reamer is inside the gear with lathe offline otherwise it will cut the key-way.
Then you'll work up to push the gear in the lathe until it fully go in, cutting the key-way to the proper fitment then you flip the gear for other side until it feels easy to put in.

I also have included FreeCAD file in the zip for additional gears you want to make, just use spreadsheet inside FreeCAD to change the number of teeth.

 

[RobinHood]

So you 3-D printed the gears? How are they working/holding up?

They'll have be reamed to the 14 mm, preferably this reamer is inside the gear with lathe offline otherwise it will cut the key-way.

If you use a spiral fluted reamer, there will not be a problem cutting into the keyway. Straight fluted ones can be a problem when you have keyways and other bore interruptions.

Another way to accurately bore a gear is to make a collet to hold the gear in the chuck by the circumference and then bore the ID to size using a boring bar.

 

[Fermic]

So you 3-D printed the gears? How are they working/holding up?

Tomorrow, I'll knock some threading on a piece of scrap to see if it works. My gears are ABS and they feel reasonably robust in my hands.

Another way to accurately bore a gear is to make a collet to hold the gear in the chuck by the circumference and then bore the ID to size using a boring bar.

I did by switching jaws in my 3-jaw chuck for outside jaws and they do very well at holding my plastic gears without ruining the teeth. My choice of reamer might not be the best because I was in a hurry for it.

 

[Fermic]

So you 3-D printed the gears? How are they working/holding up?

Update, they work great. The broken 40T with missing keyway will cause problems. I'll reprint it and label others because the debossed text are too tiny in my first iteration.

 

[Zetopan]

Hi everyone,

I modeled my missing gears for my Emco Compact 8 lathe. Wanting to save my wallet from buying the metal version of gears.

They'll have be reamed to the 14 mm, preferably this reamer is inside the gear with lathe offline otherwise it will cut the key-way.
Then you'll work up to push the gear in the lathe until it fully go in, cutting the key-way to the proper fitment then you flip the gear for other side until it feels easy to put in.

I also have included FreeCAD file in the zip for additional gears you want to make, just use spreadsheet inside FreeCAD to change the number of teeth.

View attachment 13778

What are the gear pitch parameters? e.g. Module, metric pitch, or diametric pitch? I have an ENCOMAT 8.6 (the predecessor to the much cheaper Compact 8) on which I have installed a 2 axis DRO and am looking to installing an electronic leadscrew. To perform the latter I will likely need to purchase a mating gear from the stepper/servo to the existing gear train. I want to retain the original change gear set in unmodified form. Thank you.

 

[VSWheels]

Hi everyone,

I modeled my missing gears for my Emco Compact 8 lathe. Wanting to save my wallet from buying the metal version of gears.

They'll have be reamed to the 14 mm, preferably this reamer is inside the gear with lathe offline otherwise it will cut the key-way.
Then you'll work up to push the gear in the lathe until it fully go in, cutting the key-way to the proper fitment then you flip the gear for other side until it feels easy to put in.

I also have included FreeCAD file in the zip for additional gears you want to make, just use spreadsheet inside FreeCAD to change the number of teeth.

View attachment 13778

Much appreciated. I am printing a set right now. I have printed all the change gears for a Hercus lathe and they work perfectly for thread cutting. I used PLA for those. This current set are printing in PETG. Although PLA would have been fine.

 

[Oscar f1]

included FreeCAD file

Great idea this file.
It opens fine in my Freecad 0.19 ,
but when I adjust the numbers in the spreadsheet nothing changes.
Do I need an other version of freecad ?

 

[Oscar f1]

F5 solved the problem (refresh)