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Post by dangercat on Mar 27, 2019 10:05:02 GMT -5
Homelite 750 Genesis by Justin Jacobs, on Flickr One in the background is a parts saw with badly scored piston and rough cylinder, the one in the foreground is the one I am going to get cleaned up and running again. Need a blasting cabinet and a ton of advice! Can magnesium be sanded as opposed to blasting cabinet?
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Post by tjthechainsawmech on Mar 27, 2019 11:19:56 GMT -5
Yep you can sand it like any metal but you'll be MUCH happier with a blaster. I've restored 6 saws and that's due to having a blasting cabinet. Harbor freight has them cheap.
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Post by dangercat on Mar 27, 2019 14:06:06 GMT -5
Yep you can sand it like any metal but you'll be MUCH happier with a blaster. I've restored 6 saws and that's due to having a blasting cabinet. Harbor freight has them cheap. I think you are right, might as well bite the bullet and save some time and frustration! Is aluminum oxide the recommended media for blasting magnesium?
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Post by onlyhomelites on Mar 27, 2019 14:37:43 GMT -5
Aluminum Oxide works great for me...the surface is just rough enough to accept primer very well. Skip to about the 5 minute mark of this video...the earlier stuff is a mod on the Harbor Freight cabinet:
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Post by tjthechainsawmech on Mar 27, 2019 17:05:31 GMT -5
Yep you can sand it like any metal but you'll be MUCH happier with a blaster. I've restored 6 saws and that's due to having a blasting cabinet. Harbor freight has them cheap. I think you are right, might as well bite the bullet and save some time and frustration! Is aluminum oxide the recommended media for blasting magnesium? Leon uses that as mentioned with great results. What I use is grittier and takes very little pressure. I use glass bead media from harbor freight as well.
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Post by rowdy235 on Mar 27, 2019 18:45:52 GMT -5
I think glass media is the best for Magnesium, just be very careful to not breathe it!
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Post by dangercat on Mar 27, 2019 21:42:26 GMT -5
I think you are right, might as well bite the bullet and save some time and frustration! Is aluminum oxide the recommended media for blasting magnesium? Leon uses that as mentioned with great results. What I use is grittier and takes very little pressure. I use glass bead media from harbor freight as well. Thanks for the input guys! What grit is reccomended for Aluminum Oxide Leon?
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Post by onlyhomelites on Mar 28, 2019 8:38:27 GMT -5
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Post by ronaldt on Mar 29, 2019 5:53:42 GMT -5
A blast cabinet is definitely the way to go for stripping small parts! One thing to consider is that you need a fairly large air compressor to run a blast cabinet as they consume a lot of air. Another thing to think about is plumbing in a water trap. Moist air in a bast cabinet is no good. Also make sure to drain the water out of your compressor on a regular basis. The more a compressor runs, the more condensation builds up in the tank. I work in a body shop so I could go on all day about this! Good luck and I will quit now. haha
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Post by dangercat on Mar 29, 2019 7:46:48 GMT -5
Going to be making a trip up to Harbor Freight probably today. I will likely experiment on a Mac SP81 before I use it on the crown jewel! haha Good top ronaldt, I saw where there is a water filter that plug in line between the cabinet and compressor, I will pick one up as well. Go right ahead with the knowledge, Lord knows I could use it! I could go on all day about machine guns and machine gun gunnery from the Corps but that don't help much here! haha
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Post by dangercat on Apr 3, 2019 13:00:01 GMT -5
Is the best method for cleaning after blasting using water bath then brake cleaner or the tri sodium phosphate I read about in another thread? Cabinet came in today jsut need to make a stand for it and get a shorter hose. If the air hose is under 25' is a water separator still necessary?
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Post by rowdy235 on Apr 3, 2019 18:06:36 GMT -5
That sounds as good as any other cleaning method i've heard of. THe important part is to make sure to get all of the media out.
Water separator has more to do with your air supply than anything else. I've never used one and never had a problem, but I drain my system when not in use and make sure no water accumulates.
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Post by dangercat on Apr 3, 2019 18:14:26 GMT -5
I drain mine after every use as well. Y’all were right blast cabinet it is a game changer, making a table for it tomorrow then I can start my restoration projects!
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Post by sweepleader on Apr 4, 2019 11:39:26 GMT -5
I drain my compressor BEFORE I use it. That lets it cool down since last use so vapor condenses and water has time to drain to bottom of the tank. The air will still be saturated with moisture since there will be a few drops in the bottom. That includes the air in the hose. When dry air is needed, I like to blow the hose out and let the compressor cycle once. That clears any water condensed in the hose and heats up the tank a little to reduce condensation right away.
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Post by dangercat on Apr 4, 2019 16:17:29 GMT -5
Very good tip on the air hose and draining before use, going to be taking extra precautions since I am not using the water separator at the moment.
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Post by dangercat on Apr 8, 2019 21:26:31 GMT -5
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Post by dangercat on Apr 9, 2019 17:33:53 GMT -5
Anyone ever try getting the rubber off the handle, trying to take out the trigger assembly but dont wanna rip the rubber!
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Post by onlyhomelites on Apr 11, 2019 8:40:31 GMT -5
It can be done, but it takes some time. I use a small flat blade screwdriver to slowly break the glue loose. It can take an hour or more on a part that you want to save!
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Post by dangercat on Apr 11, 2019 8:50:10 GMT -5
It can be done, but it takes some time. I use a small flat blade screwdriver to slowly break the glue loose. It can take an hour or more on a part that you want to save! Thats what I figured, I doubt there are many replacement rubber grips out there! There is a small tear in it on the underside, can that just be epoxied or is there a better adhesive for that?
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Post by sweepleader on Apr 11, 2019 12:04:26 GMT -5
I am not familiar with your exact application but I have had good luck using 3M Trim Adheasive. It is a contact cement available at autoparts stores. It works every time for me on rubbery stuff. It is not structural, it has some flex left after it has dried.
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