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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Mounting a Drill Chuck on a motor......
I need to turn an AC 1/4 HP bench motor with 1/2" shaft into a stationary drill.
I'm asking because I am not familiar with motor shafts and unsure about drill chucks. I assume I mount the 3/8" or 1/2" drill chuck on shaft with an adapter. Now do I need a left hand or right hand thread on the adapter? Also if motor shaft is 1/2" diameter and adapter is held on to shaft with set screws, and the other end of adapter is a threaded end, how should I purchase the drill chuck? what size and thread orientation? Do all shafts come with a flat area on them? Also how would I vary the speed of the motor? Thanks for your help in this. Ermel |
#2
Posted to rec.crafts.metalworking
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Mounting a Drill Chuck on a motor......
On Sunday, April 7, 2013 9:39:26 PM UTC-4, Ermel wrote:
I need to turn an AC 1/4 HP bench motor with 1/2" shaft into a stationary drill. I'm asking because I am not familiar with motor shafts and unsure about drill chucks. I assume I mount the 3/8" or 1/2" drill chuck on shaft with an adapter. Now do I need a left hand or right hand thread on the adapter? Also if motor shaft is 1/2" diameter and adapter is held on to shaft with set screws, and the other end of adapter is a threaded end, how should I purchase the drill chuck? what size and thread orientation? Do all shafts come with a flat area on them? Also how would I vary the speed of the motor? Thanks for your help in this. Ermel Here ya go... http://www.caswellplating.com/buffin...-2-throat.html G'luck -- PaulS |
#3
Posted to rec.crafts.metalworking
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Mounting a Drill Chuck on a motor......
On 2013-04-08, Ermel wrote:
I need to turn an AC 1/4 HP bench motor with 1/2" shaft into a stationary drill. Hmm ... rather small motor for the task -- especially since it is an AC motor. I'm asking because I am not familiar with motor shafts and unsure about drill chucks. I assume I mount the 3/8" or 1/2" drill chuck on shaft with an adapter. Or -- machine threads of the right size directly on the shaft, using a lathe and turning between centers. (I don't think that a hand-held die and die stock could be started straight enough to avoid problems there.) Or -- machine a Jacobs taper on the end of the shaft and mount the drill chuck with that. Probably better centering, and less flex compared to the other ways. And -- it has the additional benefit that it works equally well in both directions. Generally better chucks come with Jacobs taper mounting instead of threaded mounting. How small will the smallest drill bit used be? How large will the largest be? Imperfect centering can result in a lot of broken small bits. And large bits -- especially drilling in steel -- need a lot of torque. Now do I need a left hand or right hand thread on the adapter? Do you expect to drive left-hand drill bit? They are uncommon, and more expensive, and seldom needed for most tasks. So you would want a right-hand thread. Also if motor shaft is 1/2" diameter and adapter is held on to shaft with set screws, and the other end of adapter is a threaded end, how should I purchase the drill chuck? what size and thread orientation? Do all shafts come with a flat area on them? No -- some come with a keyway instead. Someone else has already posted a pointer to a kit for the purpose. Also how would I vary the speed of the motor? Proably -- with great difficulty -- assuming that it is a single phase motor. Single phase motors are optimized for a single speed and a single power line frequency. Any attempts to vary the speed will mostly result in very low starting torque. A three phase motor can be varied using a VFD (Variable Frequency Drive), but a 1/4 HP motor would be unlikely to have sufficient torque at low speeds. (And three-phase motors as small as 1/4 HP are hard to find.) This is the sort of thing that a DC or a Universal motor (such as found in hand-held electric drills) is particularly good at. Do you really want to run this mounted to the bench? If so -- consider mounting the motor *under* the bench, and the shaft with the chuck above it in pillow blocks -- and use a pair of step pulleys between the two with the belt passing through the bench. This would give you a few speeds -- not as nice as continuously variable, but kinder to the motor. Thanks for your help in this. Good luck, DoN. -- Remove oil spill source from e-mail Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#4
Posted to rec.crafts.metalworking
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Mounting a Drill Chuck on a motor......
On 2013-04-08, DoN. Nichols wrote:
On 2013-04-08, Ermel wrote: I need to turn an AC 1/4 HP bench motor with 1/2" shaft into a stationary drill. Hmm ... rather small motor for the task -- especially since it is an AC motor. I'm asking because I am not familiar with motor shafts and unsure about drill chucks. I assume I mount the 3/8" or 1/2" drill chuck on shaft with an adapter. Or -- machine threads of the right size directly on the shaft, using a lathe and turning between centers. (I don't think that a hand-held die and die stock could be started straight enough to avoid problems there.) They sell adapters for this, and chucks that thread on them. i Or -- machine a Jacobs taper on the end of the shaft and mount the drill chuck with that. Probably better centering, and less flex compared to the other ways. And -- it has the additional benefit that it works equally well in both directions. Generally better chucks come with Jacobs taper mounting instead of threaded mounting. How small will the smallest drill bit used be? How large will the largest be? Imperfect centering can result in a lot of broken small bits. And large bits -- especially drilling in steel -- need a lot of torque. Now do I need a left hand or right hand thread on the adapter? Do you expect to drive left-hand drill bit? They are uncommon, and more expensive, and seldom needed for most tasks. So you would want a right-hand thread. Also if motor shaft is 1/2" diameter and adapter is held on to shaft with set screws, and the other end of adapter is a threaded end, how should I purchase the drill chuck? what size and thread orientation? Do all shafts come with a flat area on them? No -- some come with a keyway instead. Someone else has already posted a pointer to a kit for the purpose. Also how would I vary the speed of the motor? Proably -- with great difficulty -- assuming that it is a single phase motor. Single phase motors are optimized for a single speed and a single power line frequency. Any attempts to vary the speed will mostly result in very low starting torque. A three phase motor can be varied using a VFD (Variable Frequency Drive), but a 1/4 HP motor would be unlikely to have sufficient torque at low speeds. (And three-phase motors as small as 1/4 HP are hard to find.) This is the sort of thing that a DC or a Universal motor (such as found in hand-held electric drills) is particularly good at. Do you really want to run this mounted to the bench? If so -- consider mounting the motor *under* the bench, and the shaft with the chuck above it in pillow blocks -- and use a pair of step pulleys between the two with the belt passing through the bench. This would give you a few speeds -- not as nice as continuously variable, but kinder to the motor. Thanks for your help in this. Good luck, DoN. |
#5
Posted to rec.crafts.metalworking
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Mounting a Drill Chuck on a motor......
On Mon, 8 Apr 2013 01:39:26 +0000, Ermel
wrote: I need to turn an AC 1/4 HP bench motor with 1/2" shaft into a stationary drill. I'm asking because I am not familiar with motor shafts and unsure about drill chucks. I assume I mount the 3/8" or 1/2" drill chuck on shaft with an adapter. Now do I need a left hand or right hand thread on the adapter? Also if motor shaft is 1/2" diameter and adapter is held on to shaft with set screws, and the other end of adapter is a threaded end, how should I purchase the drill chuck? what size and thread orientation? Do all shafts come with a flat area on them? Also how would I vary the speed of the motor? Thanks for your help in this. Ermel It sounds as though you are simply attaching a chuck to a motor shaft. If that is the case you might consider whether the motor is equipped with thrust bearings that will withstand end force on the shaft. -- Cheers, John B. |
#6
Posted to rec.crafts.metalworking
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Mounting a Drill Chuck on a motor......
On Apr 7, 7:39*pm, Ermel wrote:
I need to turn an AC 1/4 HP bench motor with 1/2" shaft into a stationary drill. I'm asking because I am not familiar with motor shafts and unsure about drill chucks. I assume I mount the 3/8" or 1/2" drill chuck on shaft with an adapter. Now do I need a left hand or right hand thread on the adapter? Also if motor shaft is 1/2" diameter and adapter is held on to shaft with set screws, and the other end of adapter is a threaded end, how should I purchase the drill chuck? what size and thread orientation? Do all shafts come with a flat area on them? Also how would I vary the speed of the motor? Thanks for your help in this. Ermel -- Ermel The ones I've seen, years back, were at Sears. The chuck itself was a cheapy that threaded onto the shaft adapter. Would be a short afternoon's work to make on a lathe, there are a bazillion different drill chucks that thread onto drill motor shafts(local hardware), wouldn't need a special Jacobs taper adapter. These chucks all have left-hand threads, they're intended to have a screw retaining them on the bottom inside of the chuck. That's usually left-handed, too. Single-phase AC motor, forget speed control. If you're willing to set up a jackshaft and belts, you'll have speed control. If you're going that far, go get an el-cheapo multi-speed HF bench drill press, lose the base and table and mod the rest into whatever powered drilling gadget you like. Cheapest one was like $50(on sale and couponed), you'll spend more than that in time and money looking to turn your motor into something it isn't. The other poster had a point on bearings, most regular GP motors aren't set up for axial loads like drilling. If you're lucky, it'll have double-race ball bearings, if not, sleeves. Also, 1/4 horse isn't a whole lot when it comes to drilling. Stan |
#7
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#9
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Maybe I need a 3/8" drill chuck, since I only need it to spin thin saxophone rods!
It would have to fit the 1/2" motor shaft! |
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