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boring a cylinder
- Thread starter shuswapkev
- Start date
- Joined
- Jun 17, 2016
- Messages
- 108
I've heard of muriatic acid being used to clean aluminium off cylinders but never met anyone who has actually done it if re-boring. If build up is thick enough it's quicker and easier to scrape or chisel it off. Basically, get rid of the worst ten set up and bore.
I've also heard a lot of theories about setting up for boring, majority are wrong for various reasons even though they work.
I've also heard a lot of theories about setting up for boring, majority are wrong for various reasons even though they work.
- Joined
- Nov 26, 2012
- Messages
- 1,307
I'm not familiar with a douglas cylinder but one thing to consider is that the boring won't have to go all the way to the head surface. It will require an offset tool. I thought I had a larger offset tool but the only one I can find gets the cutting edge about .115 from the bottom of my boring bar.
Measurements of how high the piston travels in the cylinder and the height of the top ring will give an idea if that would do the job or not.
Ideally a cutter that protrudes below the boring bar would make the machinist feel safer doing this job. Cuttings piling up in the bottom can be a concern also if there is nowhere for them to go.
My pictured boring bar is an S model that has suction for chip evac but the shroud for the cutter to make this work well would not fit the extended offset cutter. The suction would still exac a percentage of chips but not as many.
- Joined
- Jun 17, 2016
- Messages
- 108
Doh, only just checked original post date - 2014
t would probably have mounted cylinders on a 'custom' angle plate bolted to cross slide. You can flycut with tool in chuck (or on faceplate) to make sure it's 'square' then mount cylinder to it with large diameter boring bar in chuck One thing I found when boring motorcycle cylinders, sometimes you have to 'spin' much slower witha feed around 0.004"/rev. Lot of toolbits required extra clearancing as well.
t would probably have mounted cylinders on a 'custom' angle plate bolted to cross slide. You can flycut with tool in chuck (or on faceplate) to make sure it's 'square' then mount cylinder to it with large diameter boring bar in chuck One thing I found when boring motorcycle cylinders, sometimes you have to 'spin' much slower witha feed around 0.004"/rev. Lot of toolbits required extra clearancing as well.
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