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Thread: Project 1 from Trip. Category: Custom welded Shop tools and improvements

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Trip59 Project 1 from Trip.... 11-23-2012, 11:34 PM
undercut Nice project, Trip. Yeah,... 11-24-2012, 12:26 AM
zoama Good job... Here's a tip,... 11-24-2012, 12:39 AM
Rambozo I had a blast cab with a... 11-24-2012, 12:48 AM
Trip59 Ah, but I have a secret... 11-24-2012, 01:16 AM
zoama What abrasive would you... 11-24-2012, 01:34 AM
Trip59 Honestly, I'm thinking the... 11-24-2012, 02:14 AM
zoama I'll be using two coats of... 11-24-2012, 02:29 AM
Trip59 Oh, slag leaves a great... 11-24-2012, 02:46 AM
Trip59 Zoama, quick blast today,... 11-25-2012, 12:04 AM
zoama Thanks for the demo. I went... 11-25-2012, 01:05 AM
Trip59 Guessing 2x50lb bags :) if I... 11-25-2012, 02:34 AM
zoama I got 5 bags since I also... 11-25-2012, 02:56 AM
Trip59 I've done tons of plug welds,... 11-24-2012, 12:54 AM
redbeard I think the ball valve might... 11-25-2012, 06:24 AM
hooda Great thought behind this,... 12-07-2012, 12:46 AM
Trip59 Thanks! Yes, the outboard... 12-07-2012, 01:21 AM
Trip59 Quick update for those... 12-25-2012, 03:28 AM
zoama I picked up five bags of coal... 12-25-2012, 05:51 AM
everlastsupport If the wire is steel you can... 12-25-2012, 09:31 AM
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  1. #1
    Join Date
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    Middleburg Florida
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    Quote Originally Posted by zoama585 View Post
    What abrasive would you recommend for rusty cast iron exhaust manifolds that will be painted afterward ?
    Honestly, I'm thinking the coal slag. Tell you what, I happen to have a rusty cast iron manifold off a '67 327, I'll throw it in the cabinet when I go out to the shop tomorrow and blast part of it, snap you a nice pic (will do it with a real camera if the iPhone camera doesn't show it well enough).

    If not slag, I'd probably opt for something around a 70-80 aluminum oxide, blast the hell out of it, give it something like a TSP scrubbing and then hit it with some 2k* VHT unless you want to spend the money on a fancier high temp coating.

    Last one I did I used that obsidian on, was for a '68 250 chevy, stripped it down to where it looked like it just came out of the casting sand.

    The pieces I was running today with the slag were heavy sheet steel, probably 10ga or so, and some maybe 16-18 ga (electrical box from the mill) no distortion, but a lot of tooth left. I also ran a cast iron piece from the mill, horizontal table stop. Only thing it had issues with was the black filler they used originally, but then again I've had issues with that stuff with super strong stripper, knotted stainless wheels on a 4 1/2 inch grinder and 40 grit die grinder rolocs. I wish I could buy that stuff in the can, the stuff is damn near bullet-proof.

    Oh, and I'm running my PSI up around 100-110, right around the max for several of my guns and enough over the max for one that it blew an o-ring

    Now, here's the counter-intuitive part... you may want to go with a finer slag, the 30-60 rather than the 20-40, sand cast iron has lots of nooks and crannies, the finer abrasive, yet still with the sharp edges, will do a quick job. glass bead in the 80 range would do it, but would take a lot longer, leave a smoother finish. Whatever you ultimately use, be sure to clean it really well afterwards or you'll trap residue under the paint and create weak spots or little exploding spots when the media expands or thermal shocks. COE of glass vs iron is way different.
    Trip Bauer
    Former USN HT
    Everlast 200DX New Model
    Hobart Handler 125 MIG
    Van Norman #12
    Atlas 12" engine lathe
    '98 RoadKing - 84 Ironhead - 59 Ironhead

  2. #2

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    I'll be using two coats of POR-15 black velvet cured at 400゜f between coats... I want it to stay on. It needs a rough finish.
    2013 250EX : SSC Pedal : I-MIG 250P 20' Profax gun : Power Plasma 60 p80 torch : 3M Speedglas 9100XX : Evolution Rage 3 DB cold saw

  3. #3
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    Sep 2011
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    Middleburg Florida
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    Oh, slag leaves a great finish for something like that, lots of tooth. Like I said, I'm using farm and implement enamel, I couldn't be happier with the surface it left for that. I'd say it's a match, but I'll still blast the manifold tomorrow and post some pics.
    Trip Bauer
    Former USN HT
    Everlast 200DX New Model
    Hobart Handler 125 MIG
    Van Norman #12
    Atlas 12" engine lathe
    '98 RoadKing - 84 Ironhead - 59 Ironhead

  4. #4
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    Middleburg Florida
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    Zoama, quick blast today, really quick. As a measure of time relate-able to those who smoke, I lit a cig, walked to the shed and got the manifold, took a pic. I loaded it in the cabinet, flicked the ash, started blasting. The pic below is how much I blasted without the ash falling. Did that, took my hands out and flicked the ash. I'd say about a minute of blasting, maybe, probably more like 30 seconds.

    Rusty enough?



    1967 ramshorn for a 327.



    Still a bit in the small pits, hitting it with a finer slag or touch-up with bead will do it fine. Granted, this thing is old as hell, probably been rusting since '67.

    I've blasted some smooth sheetmetal, surface comes out feeling approximately like a sheet of 320 or 400 wet-dry paper.
    Trip Bauer
    Former USN HT
    Everlast 200DX New Model
    Hobart Handler 125 MIG
    Van Norman #12
    Atlas 12" engine lathe
    '98 RoadKing - 84 Ironhead - 59 Ironhead

  5. #5

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    Thanks for the demo. I went to TSC this morning and picked up 250Lb of coal slag. I didn't work on my blast cabinet today, it was too cold and windy... maybe tomorrow will be a better day.
    2013 250EX : SSC Pedal : I-MIG 250P 20' Profax gun : Power Plasma 60 p80 torch : 3M Speedglas 9100XX : Evolution Rage 3 DB cold saw

  6. #6
    Join Date
    Sep 2011
    Location
    Middleburg Florida
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    Default

    Quote Originally Posted by zoama585 View Post
    Thanks for the demo. I went to TSC this morning and picked up 250Lb of coal slag. I didn't work on my blast cabinet today, it was too cold and windy... maybe tomorrow will be a better day.
    Guessing 2x50lb bags if I had 250lbs, I'd probably just run it out by the fence rather than dealing with the cabinet... LOL

    One thing I found, I ran another couple hours today, be sure you stop when you get wet air coming out (several cycles of your compressor) it turns into black smut on the metal that's a mess. Also, I cut my hose shorter (one of them) and wiggle it around. Seems the granules like to lock up in the gun. I'm going to try another one of my rigs tomorrow. I leave the hose right at the surface, takes a little longer, but jams much less sucking up a little bit vs a full load. Currently exploring methods to improve the feed. I'm still thrilled with it though.
    Trip Bauer
    Former USN HT
    Everlast 200DX New Model
    Hobart Handler 125 MIG
    Van Norman #12
    Atlas 12" engine lathe
    '98 RoadKing - 84 Ironhead - 59 Ironhead

  7. #7

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    I got 5 bags since I also have a pressure pot for big stuff. My compressor is 120 gallon and runs very cool.
    2013 250EX : SSC Pedal : I-MIG 250P 20' Profax gun : Power Plasma 60 p80 torch : 3M Speedglas 9100XX : Evolution Rage 3 DB cold saw

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