Originally posted by Russ
Hi. I have an observation about what part of the driver is load bearing when putting weight down through the handle and using the lever arm to turn the barrel. The barrel has maybe 0.5mm to 1mm of vertical play, even when putting a lot of weight through the handle, which leads me to think that the grub screw is taking the load against the bottom of the groove in the chuck shaft, rather than the brass bushing taking the load.
Cheers
Russ
Originally posted by Russ
For my final test I disengaged the grub screw from the chuck shaft. I repeated the previous test of cutting into wood applying pressure to the handle. This time the handle fully engaged with the brass bushing and was smooth. I maintained the pressure while ratcheting and the barrel caught the chuck as expected. So on subsequent ratchets I released some pressure from the handle, then reapplied pressure as I drove into the wood. This sequence works perfectly.
In conclusion I am thinking the groove in the chuck shaft could do with being cut a tad lower than its current position.
Originally posted by Russ
I have just subjected the driver to a heavy load test by cutting a hole into wood with a 25mm flat wood bit. I took the grub screw out to inspect it and found a tiny shiny flat spot where it had contacted the bottom edge of the groove in the chuck shaft, suggesting it is taking the pressure from the handle.