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Post by springcrocus on Jul 21, 2016 17:39:08 GMT
Well, I got that wildly wrong!!  I've just been on Ebuyer and checked out PSU's and found that many have a dedicated 12 volt line at a whopping 30+ amps. Even a cheap £ 12 jobby had 20 amps so plenty. Thanks for the nudge, Jem Steve |
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jem
Elder Statesman
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Post by jem on Jul 22, 2016 16:56:52 GMT
I dont think you need to buy PSU's I have a dozen taken from old PC'c and I am sure that any second hand shop will hav them for pennies, best of luck
Jem
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Post by Roger on Jul 22, 2016 17:14:47 GMT
I dont think you need to buy PSU's I have a dozen taken from old PC'c and I am sure that any second hand shop will hav them for pennies, best of luck Jem I've found this link which gives an idea of the amount of power available for the different ratings of PC power supplies. One word of caution when using these though. Some of them won't produce a stable output without a load on the 5V rail due to the way the switched mode power supply is designs. The assumption is that the lions share of the load will be on the 5V supply, so the designer won't expect the 12V rail to be loaded on its own. |
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Post by springcrocus on Aug 2, 2016 18:43:54 GMT
So, a few more notes about my mill table feed. First, I have used it quite a bit lately and thing are loosening up nicely now. The feed disengages when a stop hits the centre support but I'm going to need to put some sort of spring bias on the lever because it jumps out of drive occasionally in one direction but the other way is fine - for now. I have added the microswitches that control motor direction and these function as expected. Moving the lever in the opposite direction reverses the motor and pressing the button makes it go flat out. However, it's more like a mobility scooter than a Porsche and I can wind it faster by hand. Still, it works.   Now, talk about not seeing the wood for the trees! I was wondering where I could get a power supply to replace the battery charger and my Dremel power supply has been sitting practically on the end of my nose the whole time. 13.8 volts smoothed and regulated, and good for 5 amps which is more than I need. I thought this motor might need more but it doesn't. The only disadvantage is that I cannot use the Dremel at the same time as the power feed but, hey, I'm not on piecework.  The other thing of note is that this windscreen wiper is a permanent magnet motor and is a great swarf attractor. So not such a smart choice after all. And I needed to get a new 10k pot from Maplins because this Chinese one on the speed controller gave up the ghost. Never mind, I have a working system and will now spend a few weeks using it and will tidy up the wiring a bit later, along with some covers to keep the swarf out. But for now, I consider this whole exercise a reasonable success. Steve |
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isc
Statesman
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Post by isc on Aug 4, 2016 13:15:36 GMT
I run my 12 volt wiper motor table feed on 18 volts, and it would take another 6 volts if I had it. The motor is an old Lucas with a wound stator, I haven't tried one with permanent magnet fields. isc
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Post by jon38r80 on Dec 11, 2016 8:45:39 GMT
Very interesting as at the moment I can't find a ready made feed for my Warco. There was a grizzly one but it seems to have been withdrawn as very unreliable. Am I missing something or is the orientation of the motor "sticking up in the air" a result of using a fairly shallow angle to fix to. If you had an apron with a hole to take the drive spindle through you could set the motor at any angle preferably horizontal. The apron wouldn't make the set up any deeper than it is now as it only need be deep enough to take the the three mounting bolt holes on a circle. The motor at the back is how I would want it as well as sticking upwards would annoy me. The top face of the commercial one I saw was level with the top face of the table which seemed ideal and was shallow like yours is.
Warco say they are developing one at the moment so may be ill wait and put up with the interminable winding back and forth.
Jon
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Post by chester on Dec 11, 2016 17:55:09 GMT
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kipford
Statesman
Building a Don Young 5" Gauge Aspinall Class 27
Posts: 576 
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Post by kipford on Dec 11, 2016 23:23:50 GMT
Jon
Warco have just anounced a power feed for the WM18, look at their site! Looking at it, it should fit the WM16 and the other clones.
Dave
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Post by jon38r80 on Dec 12, 2016 2:13:48 GMT
Apparently the we 18 doesn't fit the 16, in email with Warco they advised that one for the WM 16 will be developed now.
The one on eBay is no help as it is too deep below the table, that's why this windscreen wiper motor feed interested me. I just am too lazy/don't have the time to build one at the moment. It's the clutch and switching mechanism that I found interesting as they wouldn't be beyond me if I find the time.
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isc
Statesman
Posts: 708
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Post by isc on Dec 31, 2016 11:48:30 GMT
For a clutch a bit of suitable size hex bar, and a socket from your socket set. The clutch on my drive is even simpler, chain drive with a slack chain, just lift the chain off the sprocket. isc
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Post by ilvaporista on Dec 31, 2016 15:25:02 GMT
I am even tighter.. My 'clutch' is mounting the wiper motor on two bits of Dexion slotted angle that allow enough movement to move the drive gear on the motor in and out of mesh with the gear on the feedscrew. Control is by a model railway controller stolen fron the Christmas present train set. One of the feed wires goes through the normally closed contacts of a microswitch. That way when needed I have a way of stopping the feed at the end of a cut. But in practice I don't use it much as it cuts the supply to the motor. You then have to unmesh the gears and wind back the feedscrew by hand. I find it much easier to stop the motor by the controller and reverse to allow another cut to start
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