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APPLEGREENVW
Samba Member
Joined: November 30, 2003
Posts: 2388
Location: Seekonk,Massachusetts USA
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 Posted: Sun Jan 07, 2018 1:01 pm Post subject: Re: Hone requirements for cast Grant rings |
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| modok wrote: |
I usually use an sunnen AN hone.
One time I used one of those cheap three stone glaze-breakers, which are probably 180-220 grit, then wrapped it on 400 wet/dry and did about 10 seconds, and IMo, that was the closest I could get to a good hone job on a budget of 0$ You might research this technique, it goes back generations at this point. might be able to do something similar with dingleberry hones but I DON'T KNOW, I don't like them, but some people do use those so I guess they must work. |
Is there a video or photos showing how to wrap sand paper on a 3 stone glaze-breakers?
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mark tucker
Samba Member
Joined: April 08, 2009
Posts: 23937
Location: SHALIMAR ,FLORIDA
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| Posted: Sun Jan 07, 2018 2:23 pm Post subject: Re: Hone requirements for cast Grant rings |
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| IMHO a torque plate is useless with a dingleberry hone thingy. as for raping sand paper around a 3 stone hone I would just wrap it around my hand and do it with soap&water warm water. or I suppose if you were dead set on warpping it around a stoner thingy...probably fole it a few times and wrap it aroun a stone once and stick the pin through, be sure to wrap it the right way. slow speed, wet and try to get around a 35-50 degree cross hatch...it dosent take much at all, dont try to bore them out or add extra clearance. a few strokes is all it should need. |
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raygreenwood
Samba Member
Joined: November 24, 2008
Posts: 21520
Location: Oklahoma City
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| Posted: Sun Jan 07, 2018 2:45 pm Post subject: Re: Hone requirements for cast Grant rings |
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| mark tucker wrote: |
| IMHO a torque plate is useless with a dingleberry hone thingy. as for raping sand paper around a 3 stone hone I would just wrap it around my hand and do it with soap&water warm water. or I suppose if you were dead set on warpping it around a stoner thingy...probably fole it a few times and wrap it aroun a stone once and stick the pin through, be sure to wrap it the right way. slow speed, wet and try to get around a 35-50 degree cross hatch...it dosent take much at all, dont try to bore them out or add extra clearance. a few strokes is all it should need. |
I can factually tell you from experience....and actually measuring the surface.....its not useless with a Flexhone. Distortion is distortion.
I would wager.....that since you have this idea that Flexhones do not work at all.....and yet zillions of people havd gotten excellent results with them.....that not only are you not being careful to use it properly.....and as others have noted....you do not just crack it out of the box and get after it.....it takes some plannimg and practice.....but that you are also not doing any measuring to the surfaces you hone.....to check profile and hatch angle.
You can screw those things up even with a Sunnen hone. I have also seen poor to borderline work out of the box with factory honed cylinders. Ray |
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modok
Samba Member
Joined: October 30, 2009
Posts: 26790
Location: Colorado Springs
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| Posted: Sun Jan 07, 2018 3:46 pm Post subject: Re: Hone requirements for cast Grant rings |
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| APPLEGREENVW wrote: |
| modok wrote: |
I usually use an sunnen AN hone.
One time I used one of those cheap three stone glaze-breakers, which are probably 180-220 grit, then wrapped it on 400 wet/dry and did about 10 seconds, and IMo, that was the closest I could get to a good hone job on a budget of 0$ You might research this technique, it goes back generations at this point. might be able to do something similar with dingleberry hones but I DON'T KNOW, I don't like them, but some people do use those so I guess they must work. |
Is there a video or photos showing how to wrap sand paper on a 3 stone glaze-breakers? |
I don't know. Good description in the link I put to speedtalk, duct-take sticky side out over the stones. Just try it and you'll figure out a way. Experiment first to get the hang of it.
I think the reason that works well, is you just honed the cylinder with that hone, so when you put finer abrasive paper on there and stroke some more it's going through the cylinder the same way, using the same pressure, following the same path.
when I do the same thing with a rigid hone, I will use the finer stones mid way through the job for 20 stokes at least, to make sure the finer stones are fitted to the cylinder, then go back to the coarser stones and finish getting to size, then once I have the size I switch to the fine stones immediately and do 7-9 strokes. If the cylinder is perfectly straight you can do a plateau with a rigid hone and it will be SUPER straight as well as even. The cylinders will never be straighter then just after you finished honing it. If you went back the next day, next week, it would not work as well, which is where the flex hones might be a better idea. |
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Onceler
Samba Member
Joined: May 28, 2010
Posts: 1647
Location: Indiana
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| Posted: Sun Jan 07, 2018 5:33 pm Post subject: Re: Hone requirements for cast Grant rings |
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I used to work in a shop that supplied cyl liners to Oem diesel manufacturers. I was just a scrub so didn't know much of what was going on, but they had these big automated hones that used 2 steps and each manufacturer had their different spec.'s for crosshatch angle and surface finish profile. They would check the surface finish throughout the stone life to maintain spec. I just wonder if this level of attention is given at rebuild shops or is it kinda just experience as to what works best.
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hobbybob517
Samba Member
Joined: June 02, 2011
Posts: 1194
Location: Netherlands
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| Posted: Sat Nov 03, 2018 5:32 am Post subject: Re: Hone requirements for cast Grant rings |
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Sorry to bring up this old thread,
does anyone know the angle, Ra and Rz required?
I have access to state of the art cnc honing machines.
Thanx.
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| SBD wrote: |
3 million rpm? Well there's your problem! No wonder it blew up! |
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hobbybob517
Samba Member
Joined: June 02, 2011
Posts: 1194
Location: Netherlands
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| Posted: Sat Nov 17, 2018 3:07 am Post subject: Re: Hone requirements for cast Grant rings |
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Ra. 0.5
Rz. 4
Meassured at 0.8 x 5
for those interrested.
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| SBD wrote: |
3 million rpm? Well there's your problem! No wonder it blew up! |
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