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Post by crazycunuc on Sept 6, 2017 11:54:16 GMT -5
I'll soon be performing the task of sandblasting my cases / cylinders.
I'm pretty well good to go but thought I'd write a quick post for any last minute tips/tricks as far as masking off bearing jounals / cylinder sleeve etc etc..
Ive heard some guys putting tge cases together and only doing the outside where others do the inner tranny cases as well
Thanks!
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Post by III on Sept 6, 2017 12:04:22 GMT -5
I'll soon be performing the task of sandblasting my cases / cylinders. I'm pretty well good to go but thought I'd write a quick post for any last minute tips/tricks as far as masking off bearing jounals / cylinder sleeve etc etc.. Ive heard some guys putting tge cases together and only doing the outside where others do the inner tranny cases as well Thanks! Just be sure to fill all threaded holes with a bolt and mask off any oil lines or other openings. The real trick is to wash, wash and rewash them afterwards to ensure no glass beads are left behind. I used some pretty well spent glass beads and did the inner area of my h1 cases as well. Blasted the journals area as well, the soft glass beads didnt harm it any. |
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Post by Jim on Sept 6, 2017 13:06:16 GMT -5
Soft glass?
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Post by crazycunuc on Sept 6, 2017 13:29:22 GMT -5
Im not entirely sure what media they use other thsn I'm told its made for this. It's at a friends tool and die shop. He bought it special for when he did his H2 engine.
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Post by Walms on Sept 6, 2017 13:33:06 GMT -5
Reminds me of a local lawyer's commercial... Diamond and Diamond,
"Nothing is as tough as a diamond"
Hard, yes! Tough, nope.
I like a fresh batch of glass to get the nicest luster (on the outside)
I didn't pay any attention to the inside myself other than a good pressure wash with kerosine.
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Post by Walms on Sept 6, 2017 13:35:38 GMT -5
Im not entirely sure what media they use other thsn I'm told its made for this. It's at a friends tool and die shop. He bought it special for when he did his H2 engine. We always used glass beads, although every company is different. Another guy at work sent out some stuff out to be blasted, the company used steel shot! Destroyed the parts... always ask, never assume. |
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Post by givr on Sept 6, 2017 14:00:13 GMT -5
Glass Beads or soda/vapor blasting is best, even walnut shells work. Avoid the sand if at all possible, it will open up the aluminum which is fine if you're painting cases but will stain easily with the first drop of spilled gas or oil. A good respirator/P100 filter is also a must for this kind of work.
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Post by crazycunuc on Sept 6, 2017 15:02:17 GMT -5
Im not entirely sure what media they use other thsn I'm told its made for this. It's at a friends tool and die shop. He bought it special for when he did his H2 engine. always ask, never assume.
For sure..that's the exact reason why I made this thread. I'm 99.99% sure it's glass but will make sure before I go ahead. This guy's pretty anal with his stuff and only used it on his H2 / sold some to a local bike shop for their restorations as well.
I was planning on buying one of those cheap home kits to Soda blast my carbs sometime soon as well.
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Post by crazycunuc on Sept 6, 2017 15:05:26 GMT -5
I took these pictures of his bike last year. The cases already had a few seasons on them at that point.   |
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Post by III on Sept 6, 2017 15:28:35 GMT -5
Previously well used glass beads I saved when changing media. The used beads are not nearly as abrasive Jim. To answer your queries....
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Post by rz350ypvs on Sept 6, 2017 15:48:56 GMT -5
It's amazing how the media gets everywhere.. even after carefully blocking passages/ports. I spent hours cleaning my CB400f cases after blasting. Apparently the glass bead can become embedded in the aluminum and release itself after running the engine (I read that a few places). If I were to blast cases again, I would get them soda or vapor blasted.
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Post by sf on Sept 6, 2017 19:02:18 GMT -5
Glass and sand moves the surface of aluminum around, organic material is good for blasting aluminum. Walnut shells, soda and vapour are best.
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Post by Jim on Sept 7, 2017 8:40:53 GMT -5
The used beads are not nearly as abrasive Jim. I have limited experience blasting with glass beads, but I've heard that new beads are less abrasive because they get broken with use and end up with sharp edges. I have no idea how true this is, so this is more of a question than a statement.  |
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Post by sooperarthur on Sept 7, 2017 8:45:07 GMT -5
If you have access to a vapour blasting service go that route. The finish is incredible and won't attract dirt, oil, and finger prints like glass bead blasting will do.
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Post by III on Sept 7, 2017 9:38:26 GMT -5
The used beads are not nearly as abrasive Jim. I have limited experience blasting with glass beads, but I've heard that new beads are less abrasive because they get broken with use and end up with sharp edges. I have no idea how true this is, so this is more of a question than a statement. I can only tell you what I found out by using beads over again Jim. I had a cabinet that was full of containment and rather than sift it clean, I dumped in an old bucket of very used beads. Did a fork lower and when compared to the one I did just before changing media, I saw a difference. As stated, if you want the best results, use the steam method. That gets the best results I have seen yet. I have a compressor and a 40lb blasting cabinet, works for me. NEVER use Black Beauty or other metal media. Unless you are going for that ragged look.
dont ask. And no I didnt do it.lol Paid a local kid looking for work, 50 bucks to blast my 400 frame and bits. Even with a ton of hand sanding it was rough to say the least. |
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