Job well done, most gear trains on machine tools, tend to be noisy, listen to straight cut gearboxes, like in mini's. Those old wolf hand drills were a little noisy, but great torque. Regarding the bearings, you know you did the right thing, using the top quality bearings, as an apprentice, I was told, if a jobs worth doing, it's worth doing right. Good video 👍
Thank you for the comment and feedback! Yes you often expect the older more robust stuff to be a little noisier, although I’ve had some good suggestions from another of potential things I can check. I lived by the premise do it right do it once for many years. Since spending time in the corporate engineering world I’ve discovered if a jobs worth doing, it’s worth doing at least twice… but yes, fit the best every time!
I think the motor armature is rubbing inside the field coils. Try to loosen the attaching screws on the brush holder casting, and leave them just finger tight. With the motor running, lightly tap on the brush holder casting, to try and shift the whole armature around, and see if you can get it to stop rubbing. I see there are no dowel pins or there is no step in the machining for a register to align. So loosening the screws and shifting it around my fix the rubbing, and that terrible sound will go away. As to the motor, if the field and armature are wired in series, then yes, it is called a universal motor and will run on AC or DC current. You can use a PWM or pulse width modulated DC motor drive to give it variable speed. ----Doozer
Many thanks for taking the time to leave a comment. The lower motor housing is spigotted to the drill body, and is the lower motor bearing support although I can’t recall how much clearance it has. However I am fairly confident the motor stator isn’t touching anything as I checked for clearance around it. It’s certainly possible it could have moved a little when reassembling the head onto the column if it was knocked. After I had filmed that little bit, I had done a little research into universal motors, but thank you for clarifying that. I am aware these came with a dc motor option, so maybe they utilised the same motor with different wiring arrangements to save on manufacturing costs. A very interesting drill nonetheless!
@@theyorkshirefabshop8776 Maybe a gear shaft is bent. Consider someone may have bound up the spindle hard over the years, and one of the gears closer to the spindle may have some runout. Can you run it with half the gear cover removed? Even turn the chuck by hand with half the cover removed to see what is rubbing. Good luck with it. --Doozer
@kooldoozer thank you for the ongoing suggestions! It’s an old drill and for at least 60 years it’s been in the hands of countless other people. Who knows what life it’s lived! Unfortunately it isn’t possible to run with one half of the cover off because the cover also support the bearings. What I could do though is remove the two selector shafts and run the motor with an empty case, then introduce one gear shaft at a time to determine which is the culprit. It’s a two minute job to remove the cover so I’ll certainly try that. Thanks again!
What lubricant are you using on the gears. My full-size milling machine has a gear drive back gear with straight cut gears and it uses wheel bearing grease for lube and its nowhere near that noisy. AC-DC type motors are usually noisy, but it sounds like gear train noise in the video. Maybe a bent shaft or the riveted gears were clocked to one position and are not concentric after disassembly. Those old drills are great and were built to keep running
Many thanks for your comment. Yes, I have a much newer gear headed drill which is far quieter than this. It was worse before the rebuild, which was most likely bearing related although proves it isn’t something I’ve done! It has got a light smear of bearing grease, to protect the drive more than anything. I have had some good suggestions from others too, bent shaft being a common theme. I am going to remove the two driven shafts and run the drill with nothing in the case, then add a shaft at a time to pinpoint where the excess noise is coming from. I didn’t remove the pins, so I’m hopeful that they haven’t moved relative to the steel driven part, although the bearings set the concentricity between the gears and shaft so I don’t believe that would be the cause of the noise. I will report back with any findings!!
Job well done, most gear trains on machine tools, tend to be noisy, listen to straight cut gearboxes, like in mini's. Those old wolf hand drills were a little noisy, but great torque. Regarding the bearings, you know you did the right thing, using the top quality bearings, as an apprentice, I was told, if a jobs worth doing, it's worth doing right. Good video 👍
Thank you for the comment and feedback! Yes you often expect the older more robust stuff to be a little noisier, although I’ve had some good suggestions from another of potential things I can check.
I lived by the premise do it right do it once for many years. Since spending time in the corporate engineering world I’ve discovered if a jobs worth doing, it’s worth doing at least twice… but yes, fit the best every time!
I think the motor armature is rubbing inside the field coils. Try to loosen the attaching screws on the brush holder casting, and leave them just finger tight. With the motor running, lightly tap on the brush holder casting, to try and shift the whole armature around, and see if you can get it to stop rubbing. I see there are no dowel pins or there is no step in the machining for a register to align. So loosening the screws and shifting it around my fix the rubbing, and that terrible sound will go away. As to the motor, if the field and armature are wired in series, then yes, it is called a universal motor and will run on AC or DC current. You can use a PWM or pulse width modulated DC motor drive to give it variable speed. ----Doozer
Many thanks for taking the time to leave a comment. The lower motor housing is spigotted to the drill body, and is the lower motor bearing support although I can’t recall how much clearance it has. However I am fairly confident the motor stator isn’t touching anything as I checked for clearance around it. It’s certainly possible it could have moved a little when reassembling the head onto the column if it was knocked.
After I had filmed that little bit, I had done a little research into universal motors, but thank you for clarifying that. I am aware these came with a dc motor option, so maybe they utilised the same motor with different wiring arrangements to save on manufacturing costs. A very interesting drill nonetheless!
@@theyorkshirefabshop8776 Maybe a gear shaft is bent. Consider someone may have bound up the spindle hard over the years, and one of the gears closer to the spindle may have some runout. Can you run it with half the gear cover removed? Even turn the chuck by hand with half the cover removed to see what is rubbing. Good luck with it. --Doozer
@kooldoozer thank you for the ongoing suggestions! It’s an old drill and for at least 60 years it’s been in the hands of countless other people. Who knows what life it’s lived!
Unfortunately it isn’t possible to run with one half of the cover off because the cover also support the bearings. What I could do though is remove the two selector shafts and run the motor with an empty case, then introduce one gear shaft at a time to determine which is the culprit. It’s a two minute job to remove the cover so I’ll certainly try that. Thanks again!
What lubricant are you using on the gears. My full-size milling machine has a gear drive back gear with straight cut gears and it uses wheel bearing grease for lube and its nowhere near that noisy. AC-DC type motors are usually noisy, but it sounds like gear train noise in the video. Maybe a bent shaft or the riveted gears were clocked to one position and are not concentric after disassembly. Those old drills are great and were built to keep running
Many thanks for your comment. Yes, I have a much newer gear headed drill which is far quieter than this. It was worse before the rebuild, which was most likely bearing related although proves it isn’t something I’ve done! It has got a light smear of bearing grease, to protect the drive more than anything.
I have had some good suggestions from others too, bent shaft being a common theme. I am going to remove the two driven shafts and run the drill with nothing in the case, then add a shaft at a time to pinpoint where the excess noise is coming from. I didn’t remove the pins, so I’m hopeful that they haven’t moved relative to the steel driven part, although the bearings set the concentricity between the gears and shaft so I don’t believe that would be the cause of the noise.
I will report back with any findings!!