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The Newbies Arena Are you new to knife making? Here is all the help you will need.

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  #16  
Old 07-11-2014, 03:33 PM
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This is a good point about heat, but I did the engineering behind it.

The main reason for my choice of enclosure was the ingress protection rating. I chose a NEMA 4/IP65 rating (sealed), because I didn't want any dust getting in whatsoever. This also meant I'd need a large enclosure.

All enclosures have inherent heat dissipation properties. Even non-metallic ones, although they suck at it, have a K factor between 1.5 and 3. The published heat loss of my VFD is 81.4 Watts. I didn't want the inside of the box to ever be more than 10?C (18?F) above ambient. On other words, on a really hot day, I didn't want it to go above 50?C (122?F) inside the box.

What it boils down to (pardon the pun) is surface area of the enclosure, the K factor of the material, wall thickness and the difference between inside and outside of the box.

As empirical research, I put a small digital thermometer inside the enclosure and ran the grinder at various speeds and loads for about 45 minutes. I was able to observe a 4?C (7?F) temperature rise at around 20?C(68?F) ambient. That was good enough for me.

As a backup, the Yaskawa VFDs have a fixed high heatsink temperature alarm that will shut the VFD down if it gets too hot. This is for then the fan fails.

A enclosure rated NEMA 3R would have afforded me a much smaller enclosure with a fan, vents and filter(s), but dust will eventually get in and yes, eventually kill the fan. A steel NEMA 4 enclosure is the ideal way to go, but ultimately more expensive.

I hope to have some of the q' formula and example calculations on my blog one day.

Dan
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  #17  
Old 07-12-2014, 11:21 AM
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Here is 5 Photos of mine . http://imgur.com/BSMnVIc,Untvt0L,9Bv...Ba9M,TRNNnj2#0

as you see in the first two photos the box is where the controller is housed , the bottom has a 2 micron filter under the controller where the fan pulls fresh air in to the box . the 2nd photo shows the unit sealed and is closed up . the 4th shows the "exhaust vents cut @ a 45 Degree" up-ward to expel the air . My KMG Clone is Built Extremely heavy with modifications to suite / help me with its us and very little to no maintenance at all . using the best of the best while I redesigned it and the bearings and moving parts making them all serviceable and most important I use "Molly Grease" the motor is a sealed unit as well .

your grinder looks good . Should you or anyone need any help with building one feel free to ask any questions . If I can help , I will .


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  #18  
Old 07-12-2014, 09:14 PM
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That's a great looking machine! Very heavy duty construction.

Dan
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  #19  
Old 07-16-2014, 04:01 PM
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Thank you , and yes it is a hoss ! she will eat steel quit fast .


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  #20  
Old 07-16-2014, 04:55 PM
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Quote:
Originally Posted by R. Yates View Post
Here is 5 Photos of mine . http://imgur.com/BSMnVIc,Untvt0L,9Bv...Ba9M,TRNNnj2#0

as you see in the first two photos the box is where the controller is housed , the bottom has a 2 micron filter under the controller where the fan pulls fresh air in to the box . the 2nd photo shows the unit sealed and is closed up . the 4th shows the "exhaust vents cut @ a 45 Degree" up-ward to expel the air . My KMG Clone is Built Extremely heavy with modifications to suite / help me with its us and very little to no maintenance at all . using the best of the best while I redesigned it and the bearings and moving parts making them all serviceable and most important I use "Molly Grease" the motor is a sealed unit as well .

your grinder looks good . Should you or anyone need any help with building one feel free to ask any questions . If I can help , I will .
that's a beauty of a grinder brother Yates !!


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  #21  
Old 07-17-2014, 01:10 PM
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Thank you Brother Rob , I hope to have My New Shop finished and get things set up in it in a few months . I have a big slab of PW Steel to attempt to beat into a 32 in blade with an 8 in handle when things are set up to run . it is NOT going to be very traditional though . I have wanted to do this build for well over 30 years and the PW steel has been crying to me to finish it for a few years now . Yes I will do a WIP on this for those that have been looking to see my work .


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  #22  
Old 02-02-2015, 11:44 PM
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The latest attachment. Grizzly 10" pressed on some 3/4" DOM tube and set in 3/4" pillow blocks. Total bill about $150 with freight.



With basic How-To and Bill of Materials on my blog.

Love that Scotch-Brite belt too!

Dan
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  #23  
Old 02-03-2015, 08:19 AM
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Looks terrific! Did the Grizzly wheel run true and smooth or did you have to tweak it ?


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  #24  
Old 02-03-2015, 08:42 AM
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The wheel itself appears to be fairly well balanced. Of course, I had to align the bearings and ensure the shaft was perpendicular to the belt path, but nothing more than some small alignment tweaks. Gotta love the price of it!

Dan
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  #25  
Old 02-05-2015, 01:51 PM
dwc34205 dwc34205 is offline
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Do you have schematics and parts list for the controller set up? I have been wanting to do something like you have. Very nice work.
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  #26  
Old 02-05-2015, 04:07 PM
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I have the schematic published already:


I have not published the BOM for it yet, I could tidy it up and toss a spreadsheet up somewhere and link to it.

Dan
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