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ripi john w
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belt grinders
Aug 5th, 2012 at 3:28pm
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some of mine

reversible plate grinder

belt grinder with a platen for flat grinds

belt grinder for hollow grinds

belt grinder with a 14 inch wheel
just some of the things in the shed Smiley
cheers john
  
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Re: belt grinders
Reply #1 - Aug 5th, 2012 at 3:44pm
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Very cool, and useful.  Cool
  

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Re: belt grinders
Reply #2 - Aug 5th, 2012 at 7:01pm
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Just finished set up today, roughly slapped up fast while I was supposed to be working outside (bit here, bit there...) now in vertical mode.

What a difference having a tool rest to sit work on!!!!

  
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ripi john w
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Re: belt grinders
Reply #3 - Aug 5th, 2012 at 8:04pm
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forgot the used belt rack Grin

cheers john
  
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Re: belt grinders
Reply #4 - Aug 5th, 2012 at 8:35pm
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ripi john w wrote on Aug 5th, 2012 at 8:04pm:
forgot the used belt rack Grin

cheers john


Grin

Love it.
  
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Re: belt grinders
Reply #5 - Aug 6th, 2012 at 8:03am
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Swodem- how is it going for controlling heat, particularly when you do the edge?
  

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Swodem
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Re: belt grinders
Reply #6 - Aug 6th, 2012 at 9:45am
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I have a jug of water nearby, and have followed Ludwigs advice of holding with bare hands to use and temp guage, and quench when uncomfortable

Biggest issue with this unit right now is the belts proximity to the motor, which can get in the way

Will have a pillar-type stand fabricated to give clearance on l/h side
  
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Re: belt grinders
Reply #7 - Aug 7th, 2012 at 5:31pm
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What sort of speed do you want the belt running? I have a couple of motors laying around and one would be handy Smiley
  

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Re: belt grinders
Reply #8 - Aug 8th, 2012 at 6:56pm
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leathel wrote on Aug 7th, 2012 at 5:31pm:
What sort of speed do you want the belt running? I have a couple of motors laying around and one would be handy Smiley

If you are profiling and rough grinding before heat treatment high speed makes the process faster, but after heat treatment with the final grind a nice slow speed works well - that is why a variable speed is handy. I do not have variable speed on my main grinder, so it runs relatively slow for everything. Not sure of the belt surface speed, but pre heat treatment it rarely throws sparks while I grind.
  
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Re: belt grinders
Reply #9 - Aug 9th, 2012 at 7:58am
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Ludwig wrote on Aug 8th, 2012 at 6:56pm:
If you are profiling and rough grinding before heat treatment high speed makes the process faster, but after heat treatment with the final grind a nice slow speed works well - that is why a variable speed is handy. I do not have variable speed on my main grinder, so it runs relatively slow for everything. Not sure of the belt surface speed, but pre heat treatment it rarely throws sparks while I grind.



Cheers.
I might even have a variable spped one there, will have to check... I will set up a slow one so hardened blades can be done if I dont have a variable speed one as I have other gear that can be used to rough the initial shape out Smiley
  

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Swodem
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Re: belt grinders
Reply #10 - Aug 9th, 2012 at 10:18pm
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Super good mate of mine just got back from holiday, I was telling him about my project and the issue I was having with grinder setup (wooden blocks getting in the way)

48 hrs later - 'voila!' courier arrives with a steel stand he made

Onya mate!!

  
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Re: belt grinders
Reply #11 - Aug 11th, 2012 at 9:33am
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Righto, here is the skinny from the book;
Drive wheel dia.     Approx SFM         Aprox. SFM
    (in inches)          @1750rpm                 @3400rpm

      3                       1 500                       2 650
      4                       1 850                       3 550
      5"                      2 300                       4 500
      6"                      2 750                       5 300
      8"                      3 700                        ****
      9"                      4 150                  DANGER
     10"                     4 600
Hope this is of some use,  Smiley

(SFM = surface feet per minute)
  

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ripi john w
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Re: belt grinders
Reply #12 - Aug 11th, 2012 at 3:30pm
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interesting my grinders are doing around 4000 sfm its just right for me after 18 years of playing with them everything else just seems to slow
cheers john
  
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Swodem
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Re: belt grinders
Reply #13 - Aug 11th, 2012 at 7:29pm
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Calculated mine at 4460SFpM
  
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Re: belt grinders
Reply #14 - Aug 11th, 2012 at 8:15pm
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Single phase motors are a prick to slow down as well unless they are set up with more than one speed have tryed on a couple of ocations with not much luck.
  
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