Switchable Magnets.

[mscoffman]

Gearing does not amplify energy, it wastes it as heat due to friction.  That would simply add another loss to the system.

Bill

Remember that OU is obtained through *impedance matching* just like electrical circuits and impedance matching occurs
when the impedance of the source equals the impedance of the receiver. In a mechanical sense the distance moved in phase space being
equal is what we are looking for here, gear friction is small but unavoidable. torque after gearing is unchangeable in the device. If
Dinput <> Doutput then the problems are going to be obvious. If you've ever experience a mechanical fuel pump in a car being *poked
to death* by it's actuator rod you know what I'm talking about. The fuel pump is not using energy efficiently in that case.

[Pirate88179]

@Pirate88179,

Here's a picture of a "Magnet Chuck". What's the purpose of the "Allen Wrench" pictured along side it? It says "On" right above it. You're right, it appears many times stronger then the "Magnetic Base". Two of these Chucks should work the same way joined at the Allen Wrench, but deliver thousands of pounds in pull force to the "Rocker Arm" attracting plates.

The one on the bottom has a larger throw handle:

That Allen wrench serves the same purpose as the handle on the chuck in the bottom photo.  It mechanically moves the permanent mag array so the flux lines either line up, or they do not line up.

Don't get excited about the electro chucks.  We switched to them later on as they work forever and do not have to be rebuilt as there is no way for coolant to enter as there is no seal to fail around the handle because there is no handle.  These are just electromagnets instead of permanent mags and you need to supply a lot of power to them.  They come with their own (at least they did years ago) huge supply box which is placed near the machine.  Ours ran on 220/3 phase and had a very high amp draw although I forget what it was...60 amps or higher maybe.  There are no moving parts inside unlike the others we have been showing photos of.  The only draw back I ever saw was during a power failure, the grinders would shut down (but do not stop right away) and the electromag released the plates, and your parts, and holding plates, were destroyed.  The permanent mags still held.  Rare occurrence but it does happen.  We lost $20,000 worth of parts this way during a single power outage.  Luckily, no one was hurt from the flying parts and holding plates.

The longer handle is supplied on that model because of the effort it takes to switch on/off.  As I said, a longer lever would reduce this adding distance to the movement or maybe there are other ways of rotating that shaft inside the chuck.  But, you are right that there is a crap load of holding power to play with, so, maybe something can be done.

Bill

[synchro1]

That Allen wrench serves the same purpose as the handle on the chuck in the bottom photo.  It mechanically moves the permanent mag array so the flux lines either line up, or they do not line up.

Don't get excited about the electro chucks.  We switched to them later on as they work forever and do not have to be rebuilt as there is no way for coolant to enter as there is no seal to fail around the handle because there is no handle.  These are just electromagnets instead of permanent mags and you need to supply a lot of power to them.  They come with their own (at least they did years ago) huge supply box which is placed near the machine.  Ours ran on 220/3 phase and had a very high amp draw although I forget what it was...60 amps or higher maybe.  There are no moving parts inside unlike the others we have been showing photos of.  The only draw back I ever saw was during a power failure, the grinders would shut down (but do not stop right away) and the electromag released the plates, and your parts, and holding plates, were destroyed.  The permanent mags still held.  Rare occurrence but it does happen.  We lost $20,000 worth of parts this way during a single power outage.  Luckily, no one was hurt from the flying parts and holding plates.

The longer handle is supplied on that model because of the effort it takes to switch on/off.  As I said, a longer lever would reduce this adding distance to the movement or maybe there are other ways of rotating that shaft inside the chuck.  But, you are right that there is a crap load of holding power to play with, so, maybe something can be done.

Bill

@Pirate88179,

This variety is manufactured also along with the Electro-Magnet type:

"Electro Permanent Magnetic (EPM) Chucks operate on momentary electrical power pulse for 3-4 seconds to Switch ON & the chuck remains ON till it is again given reverse electric pulse to switch OFF. Hence there is no chance of any accidents due to power failure".

[synchro1]

syncro1,

My computer is having keyboard problems, I wanted to get back quicker then is happening.

I have decided that mechanical methods using an N52 flapper magnetic may
be simpler to design and implement then hydraulic means.

(o) Take an N52 magnet in the "Radio Shack" form factor but magnetized it across it's second
longest side. Now mount it on a shaft positioned 2/3 the way on its smallest area face drilled through to
the other. This is a flapper magnet.

(o) Now remove the knobs and mount one-to-one gearing on the input shafts. Turn the
gears to right and the right unit's face turns on(n/s), turn the gears to the left and the left
(n/s) unit's face turns on, mount the above flapper magnet such that the flapper will follow the left
right face action.

(o) Now do gearing reduction such the D-input D-output require the same actuation distance. It may take multiple
shaft reductions to get them the same. Hopefully the output side still retains the greatest torque afterwards.

(o) Link (3) units together in a loop with linkages then stand back.

This should be calculation verifiable when torques (in in-lbs) are given in the specs.
Hydraulics are nice for accumulators, but you want to get rid of Rober Val (scale like, parallel) force linkages.


..S..MarkSCoffman

@MarkSCoffman,

                        I think your ideas are ingenious. I'm having a problem envisioning this one though. Can you upload a schematic? Do you think the "Magnet Flipper" would adapt to the (EPM) or, "Electro-Permanent Magnet Chuck"? This highly engineered advancement is much better then scarfing a solenoid to a pair of switch handles. There's a strong likelihood the switch force in the (EPM) chuck is independent of the holding force like in the "Noga" Magnet Base.

[Pirate88179]

@Pirate88179,

This variety is manufactured also along with the Electro-Magnet type:

"Electro Permanent Magnetic (EPM) Chucks operate on momentary electrical power pulse for 3-4 seconds to Switch ON & the chuck remains ON till it is again given reverse electric pulse to switch OFF. Hence there is no chance of any accidents due to power failure".

Ah, that is different from what used to be.  Ah...progress.  So, they simply replaced the manual handle with a motor that moves the permanent mags into and out of position.  If they sealed it up correctly this would be a good improvement.

Sorry I missed that in your post.

Bill