Bob Warner
12-22-2001, 04:13 PM
Sounds like an ad for some big weekend sale doesn't it. For $50 a month I can get you ..................
Actually, a knifemaker that lives pretty close to me that I just met and invited over to my shop for a day of heat and beat, showed me a really inexpensive way to get a magnetic chuck. Since I am planning on building a surface grinder (Still) he brought pictures of his (surface grinder) as well as his magnetic chuck. I have to tell you I felt kinda mentally challenged for not thinking of it myself but he showed it to me and it is a great idea.
The knifemaker's name is Mike Denbow and he lives in Kaufman, Texas. I know he lurks here sometimes and I hope I can get him to register and add some of his tool works here. He really has some good ideas.
ANYWAY, back to the magnetic chuck. Go to the local scrap yard, junk yard or automotive repair place and get a bad air conditioning compressor from a car. Take the electromagnet off of it (not real easy to do) as well as the pully. The magnet fits inside the pully and when 12 volts is applied, you have a very strong magnet. I personally have an electromagent that is used for a door lock and is rated at 1500 pounds of pull and I think the compressor magnet is stronger. Not that it matters since it is plenty strong enough to hold some steel under a grinding belt, and thats the goal.
Mike mixed up some epoxy and epoxied the two pieces together and ran it under his surface grinder to true it up. He brought me some steel he ran through the grinder and it was perfect. There is one minor drawback to this chuck and that is that there is a hole in the middle of it where the bearings were but you just have to work around that.
I went to the best junk yard I have ever found (recommended by Mike) with another friend of mine today. The metal is a dime a pound. $70 later I was on my way home with stuff to make several tools, and TWO car air conditioning compressors. I have already removed the magnet off of one of them and it works great. If you want to be sure you are getting a magnet that works, just take it to your car and hook the battery to it, if it goes "CLICK" you got it made. This magnetic chuck (compressor) cost me about 50 cents, 5 pounds at a dime a pound.
Now I am considering using my door locking magnet as........well...............A Door Lock.
I am not sure if I have the ability to use something for the use it was intended, but we will see.
I hope the idea Mike Denbow passed along to me will help someone make that surface grinder they always wanted.
For those in the Dallas, Texas area, I can tell you where this scrap yard is if you e-mail me. You will want to take some money, I did not think I NEEDED 700 pounds of metal but apparently I did since that is what I bought. They even had tons of post tensioning cable, good for making cable damascus knives. I picked up a little (ok, a lot) of that also.
Actually, a knifemaker that lives pretty close to me that I just met and invited over to my shop for a day of heat and beat, showed me a really inexpensive way to get a magnetic chuck. Since I am planning on building a surface grinder (Still) he brought pictures of his (surface grinder) as well as his magnetic chuck. I have to tell you I felt kinda mentally challenged for not thinking of it myself but he showed it to me and it is a great idea.
The knifemaker's name is Mike Denbow and he lives in Kaufman, Texas. I know he lurks here sometimes and I hope I can get him to register and add some of his tool works here. He really has some good ideas.
ANYWAY, back to the magnetic chuck. Go to the local scrap yard, junk yard or automotive repair place and get a bad air conditioning compressor from a car. Take the electromagnet off of it (not real easy to do) as well as the pully. The magnet fits inside the pully and when 12 volts is applied, you have a very strong magnet. I personally have an electromagent that is used for a door lock and is rated at 1500 pounds of pull and I think the compressor magnet is stronger. Not that it matters since it is plenty strong enough to hold some steel under a grinding belt, and thats the goal.
Mike mixed up some epoxy and epoxied the two pieces together and ran it under his surface grinder to true it up. He brought me some steel he ran through the grinder and it was perfect. There is one minor drawback to this chuck and that is that there is a hole in the middle of it where the bearings were but you just have to work around that.
I went to the best junk yard I have ever found (recommended by Mike) with another friend of mine today. The metal is a dime a pound. $70 later I was on my way home with stuff to make several tools, and TWO car air conditioning compressors. I have already removed the magnet off of one of them and it works great. If you want to be sure you are getting a magnet that works, just take it to your car and hook the battery to it, if it goes "CLICK" you got it made. This magnetic chuck (compressor) cost me about 50 cents, 5 pounds at a dime a pound.
Now I am considering using my door locking magnet as........well...............A Door Lock.
I am not sure if I have the ability to use something for the use it was intended, but we will see.
I hope the idea Mike Denbow passed along to me will help someone make that surface grinder they always wanted.
For those in the Dallas, Texas area, I can tell you where this scrap yard is if you e-mail me. You will want to take some money, I did not think I NEEDED 700 pounds of metal but apparently I did since that is what I bought. They even had tons of post tensioning cable, good for making cable damascus knives. I picked up a little (ok, a lot) of that also.