Here is a list of all the postings Mike Poole has made in our forums. Click on a thread name to jump to the thread.
|Thread: Can you guess what this object is?|
A tricky thing to measure I would think
|Thread: New or old style 3 phase motors?|
Inverters have improved the waveform presented to the motors, some early inverters had very poor waveforms and produced a lot of noise and heat with the harmonics delivered to the motor. A decent modern inverter will give a motor a much easier time. Unless you have a use for the motors that you have I would run one and see if it runs happily. Inverters in the form of a UPS or power conditioner can be used to give a cleaner supply than the mains in some difficult environments.
|Thread: Surface Plate & Height Gauge recommendations|
There were a couple of Lumsden grinders in our machine shop but even though they are the king of grinders for material removal I don’t think they would trouble the rest of the machines in the shop for removal rate
|Thread: Cross slide adjustment?|
Backlash is pretty much a fact of life with conventional screws, if you have adjustable nuts then you may find that eliminating the free movement in one position will make things tight in another. As long as you always approach a setting from the same direction and if you back off make sure you exceed the amount of backlash before reapproaching your setting it shouldn’t cause any difficulties.
|Thread: internal grooves for o rings|
If the tool is rubbing the the presentation of the tool needs looking at or the clearance needs to be increased. The clearance angle is a compromise between enough clearance to cut freely and not so much it weakens the cutting edge. You could blue up the tool and see where it is rubbing and grind the high spot away, rinse and repeat until the tool cuts cleanly. Boring tools need a surprising amount of front clearance as the bores get smaller, its curious that you start clean cutting and then rub, this may mean the side clearance is the problem, check that both sides have clearance and the tool is at the correct angle. The O ring groove is usually square and the pressure you are trying to contain is what makes the O ring work as it gets behind the O ring and squeezes it to seal against the shaft and the wall of the groove.
|Thread: Workshop Gloves|
Honda Engineering build the production lines for Honda vehicles, I worked with some of them on an installation they built for us. Every day they had clean white overalls and gloves which they rarely worked without, every morning they started with a meeting to set the program for the day, this was conducted on the shop floor with everyone in a circle in the squatting position, it would kill my thighs to hold that position for more than a few seconds, luckily it was only for Honda personnel.
|Thread: Burgundy finish to tools with wooden handles?|
Although air tools and for the last 25 years battery tools were used on production the Yankee was still used in some places. My uncle had a Yankee without a speck of paint on the wooden handle and it was natural wood so I suspect it was not stained before lacquering, whatever they finished it with it was quite thick and would chip if abused. Perhaps Stanley would know if they are feeling helpful and you drop then a line.
|Thread: Workshop Gloves|
Thin nitrile or latex gloves are unlikely to pose a danger on a machine and for skin protection for anyone with a problem or sensitivity they must be a godsend. It is worth using plastic or metal screens on mag bases to keep swarf away from yourself and the machine controls. Gloves for the clean down when the machine is off are useful protection for the hands but in this case something more substantial than latex is required. Personally I never ever wear gloves but I am blessed with robust skin and having lost interest in fixing cars my hands don’t get too dirty in the workshop, Fairy liquid is my hand cleaner of choice and keeps my hands so soft.
Google degloved finger Images if you want to be put off gloves and rings.
It is nearly 48years since the induction week of my apprenticeship, two images have stuck with me, one of a finger with tendons ripped out of the forearm laid on a drilling machine table and a scrotum with dermatitis from keeping an oily wiper in your pocket. The finger was ripped off because the operator was wearing gloves and got caught by the rotating drill which wrapped ever tighter once caught. We all had to wear a snood in the machine shop as our long hair was an invitation to be scalped if you caught it in a machine.
|Thread: Hydraulic Motor|
As with others I am not visualising this motor, a bit more info would help. Many of the components in an hydraulic motor have tight tolerance and finish and will require grinding equipment to replicate, material spec and heat treatment are other unknowns.
|Thread: Experimental Vibration Analysis of a WM280 Lathe|
It would be useful to have all the data of the mechanical parts like number of balls in races, number of teeth on gears and so on, it surprised me that the vibration analysis guys could identify a cage failing on a ball race, clever stuff.
|Thread: Pillar drill running in reverse|
Try spinning it by hand in the correct direction and then start it while spinning, if it runs in the right direction then the start circuit is u/s as mentioned above.
|Thread: Experimental Vibration Analysis of a WM280 Lathe|
I did some work on vibration analysis at work, we were interested in the condition monitoring of the bearings on hoists. This proved to be rather difficult due to the short cycle time. On continuously running machines it quite easy to establish the healthy condition and see the deterioration and a traffic light monitoring system can be implemented. After installing accelerometers on the bearing blocks the data could be analyzed by an experienced eye and they did pick up some failing units early. The holy grail of the traffic light was not really workable with the short cycle and variable speed during the short cycle. My exposure to the subject taught me it is a useful tool but the analysis can be complex. It’s very useful for monitoring trends but absolutes are difficult to determine. The company we contracted motor maintenance to did regular patrols of all the important motors and these were fitted with monitoring points for the sensor of the handheld test unit. This is an interesting project SOD making sense of the data will be the hard part I feel.
|Thread: The sneering detractors|
I expect the traction’s engines running today are a bit like Triggers broom.
|Thread: Made a pair of basic V blocks.|
I would think that hardening of any method would risk distortion and need a finish grind after hardening. Unless you have an extraordinary amount of work planned I would leave as they are. If wear does become apparent I am sure a vist to the mill for a clean up pass would be easier than adventures with heat treatment. I think you have made a very useful tool that now it’s available will find lots of use.
|Thread: DIY Electric welder|
A very dodgy setup, not sure marigold gloves are approved for electrical safety. Brine starters were used for limiting the current on large motors, when I was an apprentice there was still a couple in use for starting the 600hp motors on the air compressors in our power house. Long gone now though.
|Thread: A polite note to beginners from ARC|
I like the way Ketan is prepared to share the reasoning behind what he does. I remember when he explained his reasoning for withdrawing from the show circuit, as much as I enjoy seeing the trade stands at shows the world has changed and now we can see detailed pictures and specifications with videos of equipment in action all online. I think we forget that many of the suppliers we use have other customers apart from the niche of the home workshop. Full marks from me to Ketan for indulging us with the interesting insights to the import business, unfortunately I had assembled most of my workshop and tooling before Arc entered the fray so my tool acquisition is mainly consumables and things that I develop a need for or just fancy but Arc are well up on my preferred supplier list.
|Thread: Aircraft General Discussion|
|Thread: Look what I Found|
I don’t know why they bothered to invent Chobham armour, the bricks in my mums bungalow would certainly stop any armour piercing weapons, they just laugh at tungsten carbide and hammer drills. Now I have an SDS machine I will try that if the need arises.
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