The Craftmans Shop > New from Old
Rebirth of a 6 Foot Flail Mower
vintageandclassicrepairs:
Hi Andrew,
I am enjoying watching the progress on this project
You neatly skipped the reassembly of the gearbox
Was there much involved in setting up the gear mesh and or preloading the pinion bearings??
I rebuilt a Moto Guzzi bevel box last week, same idea on a smaller scale
John
awemawson:
I set the pre-load on the opposing taper rollers on the pinion shaft by feel - no book values to work to so I set it (with that locking nut that I had to make) to give slight resistance to turning. For the wheel pinion mesh there were shims on either side that I had to juggle with, again just by feel - a compromise between zero backlash and smooth operation.
The result is a marginally stiff box,though easy to turn by hand, my argument being it will become looser in use not tighter.
awemawson:
Time rather short today as the bacon was due to be sliced having finished curing - 60 packs of 6 rashers cut to a generous 6 MM :clap:
However I got on and made up new studs to replace ones damaged on some U-clamps when I had to cut them off with oxy-acetylene :bang: These clamp the 60 mm tubular 3 point linkage to another 60 mm tube that runs the width of the flail. I'd hoped to save the studs by just heating the nuts and apply massive torque, but they started shearing :ddb:
So, first prepare 8 off 20mm blanks, chamfer them, thread them M20 x 2.5 - then eventually they will be welded onto the U shaped bit of the original clamp having cut off the studs. That will need some form of jig to keep the spacing accurate.
I used a Coventry Diehead - always a bit tricky on the larger threads as the torque is enormous. The inconsistent length of thread is because the die head was moving my carriage stop before tripping and opening the dies. Doesn't matter as the errors are longer rather than shorter.
Will_D:
--- Quote from: awemawson on October 12, 2016, 01:02:39 PM ---Time rather short today as the bacon was due to be sliced having finished curing - 60 packs of 6 rashers cut to a generous 6 MM
--- End quote ---
Is this closure on the new pig-stys thread and thier cute little inhabitants? :bugeye:
Another great build Andrew - you are an inspiration
awemawson:
Never mind Will, Robert the Boar will be coming to stay shortly and the cycle will start all over again :lol:
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version