Deutsch[MLC] Clutches, brakes and more
Hi folks and welcome to another Donkey update.
A real challenge was the construction of the drum chlutch mechanics. I choosee the system named Wern-Patent, which was widle used by Orr&Sembower as well.
To attach the drum to the drive gear, the drum is pushed sidewise on the main shaft. This is done by a threaded part, which pushes the drum over by use of some other small parts. The problem has been the pitch of the thread and the fact that I needed two, but one in lefthand and the other in righthand thread.
The solution I used to manufacture these parts is simple. I mounted the vise on the mill to the correct angle and milled vertical slots into a piece of brass tubing. Once done, I soldered them to a core piece and finished them to shape.
The other part is a U shaped bow. I silversoldered two pieces of steel togetherand finished them with more milling and filing. The larger hole will take the brass pieces above and allow them to turn. A 3mm pin is pressfitted into the small hole on top and grabs into the grove on the brass parts. Pin and grove will transmit the turn into a sideways movement.
The brass part will than push a steel pin inside the hollow main shaft and by another link and bushing, its transfered to the drum. The levers are also hand milled from mild steel.
Last parts missing were the band brakess which are riding on the wider side of the drums, bear the bull gears. They are operated by foot pedals below the clutch levers. With those parts added, the engine itself is nearly compete. Last photo gives a sneak preview to the next update. It will feature the wooden sleed, logging blocks and much more finishing work.
See you next time,
GerdHi folks and welcome to another Donkey update.
A real challenge was the construction of the drum chlutch mechanics. I choosee the system named Wern-Patent, which was widle used by Orr&Sembower as well.
To attach the drum to the drive gear, the drum is pushed sidewise on the main shaft. This is done by a threaded part, which pushes the drum over by use of some other small parts. The problem has been the pitch of the thread and the fact that I needed two, but one in lefthand and the other in righthand thread.
The solution I used to manufacture these parts is simple. I mounted the vise on the mill to the correct angle and milled vertical slots into a piece of brass tubing. Once done, I soldered them to a core piece and finished them to shape.
The other part is a U shaped bow. I silversoldered two pieces of steel togetherand finished them with more milling and filing. The larger hole will take the brass pieces above and allow them to turn. A 3mm pin is pressfitted into the small hole on top and grabs into the grove on the brass parts. Pin and grove will transmit the turn into a sideways movement.
The brass part will than push a steel pin inside the hollow main shaft and by another link and bushing, its transfered to the drum. The levers are also hand milled from mild steel.
Last parts missing were the band brakess which are riding on the wider side of the drums, bear the bull gears. They are operated by foot pedals below the clutch levers. With those parts added, the engine itself is nearly compete. Last photo gives a sneak preview to the next update. It will feature the wooden sleed, logging blocks and much more finishing work.
See you next time,
Gerd
