monna0000
starting to spend too much on rocks
Member since May 2016
Posts: 243
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Post by monna0000 on Jan 13, 2017 17:30:21 GMT -5
I need some advice regarding on wich wheels i need as I'm not happy about the wheels/disc's i have at the moment as i experience to many bumps on my cabs. At the moment i have Grit 80 diamond hard wheel 220 diamond hard disc(for a flat lap) 375 soft wheel 600,1000,1500 and 3000 diamond hard disc(flat lap) I also have 2 expansion wheels But i can't really find the right setup What are your recommendations?
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Post by pauls on Jan 13, 2017 19:29:17 GMT -5
That all looks good, but if your hard wheels are leaving flat bumpy bits that are difficult to remove (Ithink thats what you mean) then you may need a soft wheel around the 180 220 range to smooth all those bumps out. Never underestimate the importance of getting everything perfect (no Bumps, flat spots and scratches) when using the coarser grits, the finer ones will take ages or just never get there.
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Tommy
Administrator
Member since January 2013
Posts: 12,665
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Post by Tommy on Jan 13, 2017 20:05:57 GMT -5
I agree with Paul - your transition between hard and soft is too much to overcome. Many people - myself included - go up to around 200 on the hard wheels then drop back down to 140 soft. After 140 and 280 soft there should be zero flat spots and a perfect dome without valleys that will display scratches later.
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Post by rockjunquie on Jan 13, 2017 20:54:15 GMT -5
On my machine, I go from 220 hard to 280 soft. You could even go 220 hard to 220 soft. Yes, after the hard wheels, you should have your shape done as well as you can. The rest of your wheels are for prepolish and polish, or another way of looking at it- they are just for getting scratches out.
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NDK
Cave Dweller
Member since January 2009
Posts: 9,440
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Post by NDK on Jan 13, 2017 21:31:04 GMT -5
I think you've all overlooked she uses diamond hard discs on the upper stages (600+). This may be why you're getting flat spots. I've only seen 1 person on here ever get a perfectly formed cab on all hard discs.
If the discs are flexible and mounted on a metal lap, try cutting a circle of craft foam to put in-between. That would allow some give to make up for the flat spots.
Good luck!
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