Needs Pictures: 0
Picture(s) thanks: 0
Results 1 to 4 of 4
Thread: Seed drill wheel hub job
-
2nd Aug 2022, 12:35 AM #1
Seed drill wheel hub job
My neighbour has a seed drill which has eight tires in the back. Those wheel are connected to a common shaft with four wheel hubs. Two of these were originally welded on the shaft and other two are floating to allow tightening the wheels in place.
For some reason the welded wheel hubs came loose and the wight tires were not rotating with bearings as intended but over the shaft which was badly worn. The wheel hubs were damaged quite badly as well in the process.
I will now straighten the wheel hub center holes.
In this video I am using:
- Schaublin SV-51 (1955) Milling machine
-
2nd Aug 2022, 10:28 PM #2Golden Member
- Join Date
- May 2020
- Location
- Willowbank QLD
- Posts
- 517
I know you are not asking a question about why this failed. If all the wheels are on a common shaft, when the seeder goes around a corner there will be a big differential in what speed the inner and outer wheels will want to turn. This may cause unwanted stress on the welds. If you agree that this may be a contributing factor to failure a minor redesign may be required.
Steve
-
4th Aug 2022, 09:03 PM #3
Steve, we were talking about this design failure with Robert. They repaired the welds a lot stronger with weld bevels and all.
The seed delivery mechanism is driven by the wheel so at least other half must remain connected to the shaft. The other four wheels could be floating but then there is a possibility that a bumb in the field lifts the driving wheels off the ground and no seends come out.
-
4th Aug 2022, 09:54 PM #4Golden Member
- Join Date
- May 2020
- Location
- Willowbank QLD
- Posts
- 517
Hopefully the fix works and it is not a problem. What I have seen on some with a wheel on each end is the "drive" wheels drive against and protrusion on the shaft. What this allows is if the outer wheel drives the shaft faster than the inner wheel wants to turn when going around a corner, the shaft can spin faster than the wheel.
What also may help is just having the four center wheels welded to the shaft. That way the speed differential between the drive wheels won't very as much.
Hopefully your welding of the wheels is not stronger than the torque the shaft can transmit.
Steve
Similar Threads
-
Hercus #3A or #1 T&C smaller wheel guard and Hercus #3A wheel shaft pulley.
By lamestllama in forum METALWORK - Machinery, Equipment, MARKETReplies: 8Last Post: 30th Aug 2019, 12:01 PM -
Four Facet Drill Sharpening and Grinding Wheel Dressing
By metaler in forum METALWORK GENERALReplies: 15Last Post: 20th Oct 2017, 07:52 PM -
Grinding Wheel
By Oldneweng in forum METALWORK GENERALReplies: 18Last Post: 15th Jan 2017, 06:07 PM -
Which wheel is which?
By ElDubya in forum METALWORK GENERALReplies: 3Last Post: 4th Oct 2008, 08:09 AM -
Lap grinding wheel
By ROB NZ in forum METALWORK GENERALReplies: 6Last Post: 20th Jan 2008, 06:42 AM