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+---- Forum: Surface Grinders (http://www.metalworkingfun.com/forum-31.html)
+---- Thread: Burn streaks on the work (/thread-2050.html)
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RE: Burn streaks on the work - Mayhem - 03-18-2014
Thanks for posting that video Tom - I found it very interesting. I know next to nothing about surface grinders, only having seen them in operation a couple of times. I too wouldn't mind adding one to my shop but like most things here, they are few and far between (or well out of my price range).
RE: Burn streaks on the work - Sunset Machine - 03-18-2014
Operation is pretty simple, just practice rubbing your tummy and patting your head - but it's the wheels that throw me. Each grit size comes in 26 levels of hardness and a bunch of different binders and types of grit, and I'm a-thinkin there's a reason for each. For example, the wheel in the photo produces a nice finish on structural steel that I use for fixtures & spacers, but it's failing miserably on the chuck. Which wheel to use is always the question.
RE: Burn streaks on the work - Sunset Machine - 03-23-2014
Good video! Traversing the table as fast as I can made the results so much better. This is per the grinder manual, .050 stepover, 60H grit, final pass @ .0001"
RE: Burn streaks on the work - stevec - 03-24-2014
RE: Burn streaks on the work - PixMan - 03-25-2014
Looks like you nailed it! Great job!
RE: Burn streaks on the work - Sunset Machine - 03-26-2014
Except at the bottom edge when my arm went numb. Btw, there's a direct drive single phase old pump motor spinning that grinding wheel.
RE: Burn streaks on the work - PixMan - 03-26-2014
Single phase motors on surface grinders are often the cause of the indulating pattern in the surface, that's why the good ones all come through with 3-phase motors. I encourage you to swap that motor out and run a 3-phase thru a VFD or rotary phase converter.
RE: Burn streaks on the work - krv3000 - 03-26-2014
hi well as i use one of thees at work see if this will help you we only get the stones of a locale company and they have a chart that covers their range of stones and Wat to use them on as most things at work is ether d2 or gage plat or cast we only have 4 types of stone blue = gage plate black d2 pink cast White forming if you get your stones from one supplier see if they have a chart to cover their stone range and use
RE: Burn streaks on the work - Sunset Machine - 03-27-2014
Here's the roughing pass, 46K, .0015" with a .050" stepover. The motor might have something to do with this, I dunno. What do you think, krv3000? Does this look normal for a rough pass?
RE: Burn streaks on the work - DaveH - 03-29-2014
DaveH