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John255

DIY Magnetic Trimming Chuck

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John255    6

The Magnetic Trimming Chuck can be a weekend project if you have a few hand tools and some experience cutting sheet metal. The 11.5" diameter steel disc is cut from galvanized sheet stock bought a Home Depot for $4. Although I didn't try it, you could probably get the same result using the bottom of a 11" two-part quiche (steel not aluminum) baking dish bought from a kitchen shop or Amazon, and forgo the cutting.

 

The steel disc is glued to any 12" bat that already fits your wheel. I stuck mine together with strong double sided sticky tape. Four 1/4" Neodymium magnets are countersunk and epoxied to three 1.75" square pine blocks. (See photos) Dimensions are not critical, but it is a bit of a trick to keep the magnets from jumping together during assembly. The blocks were faced with scrap foam Gripper Pad, but any medium stiff foam can be used.

 

So far the magnet trimming holder works well and is somewhat easier than using clay wads. I have yet to make up a set of extension dowel rods for holding tall pieces, but will get to it soon. This device is about 1/10 the cost of Giffin Grip and can be used on pots of any shape. Good luck and let us know how it goes, and if you have improvements. Please see edit below.

John255

 

11" Steel Quiche Pan:

 

http://www.amazon.co...s=steel+pie+pan

 

Magnets:

 

http://www.amazon.co.../ref=pd_cp_hi_1

 

Gripper Pads:

 

http://www.amazon.co...seller=&sr=1-65

 

 

Edit:#1

 

Hardest part of project is epoxying magnets, so I've added a magnet assembly jig. The photos show how to use it to make the three magnetic blocks. When chuck is finished first center your pot then slide the blocks to hold the pot. Not much pressure is needed.

 

Edit #2

To all members who are thinking of building a Magnetic Trimmer,

 

My attempts to build simple extensions for trimming tall pots were complicated.

 

Another approach I use successfully is to throw a double-ended trimming chuck and bisque

 

it then center it on the mag-trim. (See photo) Dimensions are not critical.

 

I use a bulls-eye level to level the pot in the chuck. (This assumes your wheel is level.)

 

You could also buy a set of extensions from Bailey for about $16 and screw then to the mag-trim blocks.

 

http://www.baileypot.../quicktrim2.htm

 

Good luck with your Mag-trim, and let us know how it goes.

 

John255

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John255    6

Very clever. I'm guessing those magnets are quite strong.

 

 

Benzine,

Thanks for the comment.

Yes, the Neodymium magnets are quite strong.

I think three on each block would have been enough, but the extra strength may come in handy when using the extensions for tall pots.

John255

 

 

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Diz    2

Great idea!! Thanks John 255 - now our Art Center can have a couple new trimming chucks - Griffins are too expensive for our budget.

 

Diz

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John255    6

Diz, Jo-Ann, Docweathers,

Thank you for the kind comments. Makes it more enjoyable.

John255

 

Giltex58,

The blocks were faced with Grabber Pad material stuck on with doble sided tape.

Good luck with your chuck. Let us know how it goes.

John255

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Denice    243

John I'm making one too, I ordered the magnets off of EBay and the quiche pan off of Amazon but it got back ordered. It looked like a project I could handle by myself. My husband whose in the engineering field dismissed it at first, then took a closer look at it and the griffin grip system and decided that yours could work. I'm anxiously waiting for my components to arrive. Denice

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docweathers    79

I have used those rare earth magnets on some projects myself and I'm always amazed and sometimes frustrated by how well they stick.

 

do you have any difficulty getting the magnets to slide on the pan to adjust to the diameter of your pot.

 

I have ones on the side of my propane tanks to mark the icing point/ propane level so that I can tell next time I go to fire (after the ice is gone) how much propane I have left. I slide them down as my propane level drops, but sometimes it can be fairly difficult to move even the little ones.

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John255    6

John I'm making one too, I ordered the magnets off of EBay and the quiche pan off of Amazon but it got back ordered. It looked like a project I could handle by myself. My husband whose in the engineering field dismissed it at first, then took a closer look at it and the griffin grip system and decided that yours could work. I'm anxiously waiting for my components to arrive. Denice

 

 

Denice,

I'm glad to have someone actually making up a Mag-Trim.

I'm making two more and also have the pans on backorder.

I can tell you from experience that it does work.

It also has the advantage over Giffin that any shape pot can be held securely, even a square one.

However, you must first center the pot visually and then set the magnetic blocks by sliding them.

Please let me know if you have questions about assembly.

It is important to hammer the carpet tacks down flush on the magnet assemble jig.

It will also help if you sand the jig flat so that all of the heads of the tacks ar the same height.

Good luck, and let us know how it goes.

John255

 

 

 

 

 

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John255    6

I have used those rare earth magnets on some projects myself and I'm always amazed and sometimes frustrated by how well they stick.

 

do you have any difficulty getting the magnets to slide on the pan to adjust to the diameter of your pot.

 

I have ones on the side of my propane tanks to mark the icing point/ propane level so that I can tell next time I go to fire (after the ice is gone) how much propane I have left. I slide them down as my propane level drops, but sometimes it can be fairly difficult to move even the little ones.

 

 

Docweathers,

The earth magnets are indeed powerful.

I used four magnets on each block because the extension arms for tall pots will apply some tilting leverage.

The blocks will slide without too much effort, and so far seem manageable. Slight rotation helps start the slide.

However, three magnets would probably be adequate if the extensions are not used.

Another advantage of the Mag-Trim is it is easy and cheap to make as many custom blocks as you need for odd shaped pots.

John255

 

 

 

 

 

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John255    6

John I'm making one too, I ordered the magnets off of EBay and the quiche pan off of Amazon but it got back ordered. It looked like a project I could handle by myself. My husband whose in the engineering field dismissed it at first, then took a closer look at it and the griffin grip system and decided that yours could work. I'm anxiously waiting for my components to arrive. Denice

 

 

Denice,

The quiche pans have arrived from Amazon and I've completed two more mag-grips.

The 11" pan bottoms are fairly thick gauge steel and they work just fine, so this is easier/safer than cutting tin.

Hope you have started on your project.

John255

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Claypple    29

I am missing something. Why do you have to build the block, attach the magnets, etc. Why cannot you just use the magnet blocks like on the photo below? They are $0.99 a piece.

 

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Mark C.    1,808

I am missing something. Why do you have to build the block, attach the magnets, etc. Why cannot you just use the magnet blocks like on the photo below? They are $0.99 a piece.

 

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Most wheel heads are aluminum not steel so magnets will not stick well . The wood blocks make for a larger softer easy to grab unit with padded ends on the clay.

I am guessing all this from the photos as I never have made any of this.

Mark

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John255    6

Nice to see the thread come alive.

Good to hear from all of you.

A steel wheel head would be some advantage in going magnetic.

I've never seen one, all of the wheels I've owned were aluminium. Interesting.

The theme of the project is DIY for those who enjoy making their own tools.

I think I enjoy that about as much as making pots.

Cheers,

John255

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muddybuddy    0

John,

This is a wonderful idea. Thank you so much for sharing! I usually trim without using clay lugs, but there have been a few times when I've coveted a Giffin Grip but couldn't justify the cost. You've made the perfect solution! Can't wait to make one. I have your links (for ordering pan and magnets) on my screen, but three questions come to mind:

 

1) If 1/4" magnets are good, would the 1/2" ones be even better, especially for taller items; or is 1/4" more than sufficient?

 

2) Have you made the extension rods for taller items yet, and will they fit within your current wood squares?

 

3) You suggest countersinking the magnets, and they do appear sunken to the surface of the wood in one photo. Countersinking would provide more protection for the magnets I would imagine; but in the last photo, there appears to be a space between the paper and the top piece of wood, suggesting the magnets may be glued onto the surface of the wood. This would seem to be easier than trying to align counter-sunk holes with the magnets resting on the tacks. Am I mis-reading the photos? (Perhaps the third photo shows the initial process before the magnetic attractiveness inspired the last photo????

 

Thanks again for such a creative idea. I look forward to hearing from you.

Muddy Buddy

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John255    6

Dear Buddy,

 

Happy to hear that you would like to build a mag-trim.

 

1) If 1/4" magnets are good, would the 1/2" ones be even better, especially for taller items; or is 1/4" more than sufficient?

 

The 1/4" magnets have quite strong pull when stuck to the steel. In fact three would have probably done the job. However, they are easily adjusted into place by dragging starting with a bit of a twist.

 

2) Have you made the extension rods for taller items yet, and will they fit within your current wood squares?

 

I hope to use 1/4" dowels plugged into a 45deg. block that will glue to the top of present blocks. Maybe next week if all goes well.

 

3) You suggest countersinking the magnets, and they do appear sunken to the surface of the wood in one photo. Countersinking would provide more protection for the magnets I would imagine; but in the last photo, there appears to be a space between the paper and the top piece of wood, suggesting the magnets may be glued onto the surface of the wood. This would seem to be easier than trying to align counter-sunk holes with the magnets resting on the tacks. Am I mis-reading the photos? (Perhaps the third photo shows the initial process before the magnetic attractiveness inspired the last photo????

 

I started out with countersink, but it was a job to get the right depth not having the proper tools. I know many guys out there didn't think to marry girl carpenters being interested in other skills, so to make the project easy I gave up countersinking and just epoxy the magnets to the blocks. The down side is the magnets scratch the surface of the tin plate which in time may be a rust issue. I've thought of a couple coats of water-base-poly on the tin may offset that, but have not tried it. See attached photo, and BTW, don't forget to use the wax-paper on the jig.

 

BTW#2, for those of you who are selling casseroles like hot cakes, I should mention that Bailey has two versions of a magnetic system for about $90 that looks very nice and professional, but very impersonal. See link:

 

http://www.baileypottery.com/potterywheels/quicktrim2.htm

 

Thanks for your kind comments.

 

 

 

John255

 

 

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muddybuddy    0

Thanks for such a quick reply, John! And for the link to Bailey's magnetic system as well. It was helpful seeing that; but like you, I enjoy the "personal" aspect of DIY . Will place my order for the supplies right away and hope they're not out of stock.

 

BTW, perhaps a layer of sturdy nail polish (such as Sally Hansen's "Hard as Nails") on the magnets would help prevent their scratching the steel "bat."

 

If rust does attack the scratches already in your steel plate, try evapo-rust.com. I've had great success with it on some excess tools I stole from my hubby to use in the studio but ended up also using in the garden--and found them much later buried in my compost pile, rusted so badly I thought there was no hope of salvage. See www.evapo-rust.com or www.pricemachine.com. $12.00 for 32 oz.

 

Many thanks, again, for sharing.

Muddy Buddy

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koreyej    1

I am missing something. Why do you have to build the block, attach the magnets, etc. Why cannot you just use the magnet blocks like on the photo below? They are $0.99 a piece.

 

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Where did you get these magnets?

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John255    6

Thanks for such a quick reply, John! And for the link to Bailey's magnetic system as well. It was helpful seeing that; but like you, I enjoy the "personal" aspect of DIY . Will place my order for the supplies right away and hope they're not out of stock.

 

BTW, perhaps a layer of sturdy nail polish (such as Sally Hansen's "Hard as Nails") on the magnets would help prevent their scratching the steel "bat."

 

If rust does attack the scratches already in your steel plate, try evapo-rust.com. I've had great success with it on some excess tools I stole from my hubby to use in the studio but ended up also using in the garden--and found them much later buried in my compost pile, rusted so badly I thought there was no hope of salvage. See www.evapo-rust.com or www.pricemachine.com. $12.00 for 32 oz.

 

Many thanks, again, for sharing.

Muddy Buddy

 

 

 

Whoops!

Muddy "Buddy" I thought you were a man.

Good info on the rust chemicals.

Thanks for that. Hope we don't have to use it.

Let us know how your build comes along.

John255

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John255    6

I am missing something. Why do you have to build the block, attach the magnets, etc. Why cannot you just use the magnet blocks like on the photo below? They are $0.99 a piece.

 

post-19169-136280160289_thumb.jpg

 

 

 

 

 

 

Where did you get these magnets?

 

 

 

Koreye,

Please see the beginning post for links to everything.

John255

 

 

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