Getting started at new place

**randallss7** · 01-28-2015, 10:08 PM

now lets take a step back, here are some more pics of my flat platen, up till now all my grinding has been flat grinding free hand, I never could get a good process for a grinding Jig and hated the overly large tool rest it takes to use one. I also think its faster to learn to do it by hand and builds skill on the grinder. Phase 3 will be a large wheel so I can do some hollow grinding I will learn to do this free hand also, cause that's how I roll...lol. So since I last posted on the flat platen I added a 3/8" x 2" wide piece of mild steel behind the 1/4" thick A2 tool steel this gives me a good amount of clearance for working on the corners of my platen.

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**crashdive123** · 02-03-2015, 06:55 AM

Awesome. I'm sure you already know this, but be careful about running the small wheels for too long. Since they're turning reeeeeeealy fast and so small they don't dissipate the heat too well. Bearing tend to burn if you run them too long.

**randallss7** · 02-03-2015, 08:12 AM

So far so good this grinder turns slower than my other one. The idler wheel bearings get warm everything else seams to stay pretty cool. But I'm keeping an eye on it. Thanks for the tip.

**randallss7** · 02-03-2015, 01:57 PM

I want to add a large wheel say 10-12" but I'm not sure I would really get into hollow grinding as I am a big fan of flat grinding, I think they make better out door blade personally. Any way a good large wheel with good bearings seam to be mucho expensive every where I look.

**crashdive123** · 02-03-2015, 04:30 PM

I picked up a wheel (8" diameter/2" wide) - some kind of dense plastic/rubber - not sure of the material - from a trailer manufacturer here in town a few years ago for less than $10 - picked up some high speed bearings for about $30 and had a local machine shop press the bearings for me.

Poor mans wheel.....still going strong.

**randallss7** · 02-03-2015, 05:07 PM

Originally Posted by crashdive123

I picked up a wheel (8" diameter/2" wide) - some kind of dense plastic/rubber - not sure of the material - from a trailer manufacturer here in town a few years ago for less than $10 - picked up some high speed bearings for about $30 and had a local machine shop press the bearings for me.

Poor mans wheel.....still going strong.

I was looking at that type of wheel today, but couldn't find exactly what I was wanting. I will keep checking different places.

**randallss7** · 02-22-2015, 06:50 PM

The JACUZZI motor bit the dust today...lol I have ordered a new 3 phase 1hp motor with a lower RPM also.

**MrFixIt** · 02-23-2015, 07:32 AM

Originally Posted by randallss7

The JACUZZI motor bit the dust today...lol I have ordered a new 3 phase 1hp motor with a lower RPM also.

You don't have to replace the motor. Just eat a lot of beans about an hour before you plan to use it.
Just sayin'...

**crashdive123** · 02-23-2015, 03:34 PM

That might work in the jacuzzi, but it won't turn a 2 X 72 belt grinder at 5,000 fpm. Just sayin.

**Rick** · 02-23-2015, 04:04 PM

That would take a lot, I mean a LOT, of beans.

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**randallss7** · 02-23-2015, 10:43 PM

Well funny enough we had a good old pot of beans and cornbread for dinner tonight...lol

**randallss7** · 03-07-2015, 08:37 PM

1 HP 3 phase motor and VFD in, installed and running. I need to get some new wiring this is what I had laying around.

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**crashdive123** · 03-07-2015, 10:50 PM

Sometimes I think it would be nice to have a VFD instead of being wide open all of the time.

**randallss7** · 03-08-2015, 10:57 AM

So I may get to use it today, I have not played with it other than just starting it and adjusting the speed, tried to bog it down with a scrap piece of metal, it has more than enough power cant even slow the belt. I went with a much slower motor on this one to try and get the SFM down to a more reasonable speed for metal work.

1800 rpm motor
4" drive wheel

4" x pi = 12.566" per revolution
12.566" x 1800 rpm = 22618.8 SIM
22618/12 = 1884.9 SFM

so if my calculations are correct I'm running 1884.9 SFM at full speep compared to the 3560 SFM from the Jacuzzi motor....we will see?

**crashdive123** · 03-08-2015, 04:19 PM

My Wilton is running around 4,500 SFM.

My GIB is running around the same.

I have a third grinder running about half that speed. I have found that the lower speeds wear out belts at a much higher rate.

**randallss7** · 03-08-2015, 04:37 PM

from what I can tell 4500 ish is recommended top speed for high quality ceramic belts and you need to slow it down from there lower quality belts and oxide type belts. I ground a couple knives on it today at 45hz which I would assume to be 3/4 my top speed, I do not know about belt life yet but I will tell you that speed is baby smooth the blades came off what I would consider precision ground I used a 60g Norton blaze orange and then finished with a gator 220g they are baby smooth and are going to require very little hand sanding....WIN. I normally use an 80g to start but didn't have one handy today. I ultimately used that speed because it just felt good. I have some Iron Wood scales to work on today or when I get to that part I'm dying to see if the slower speeds will remove the material with less or no burn and how the belt holds up to that. Ironwood will run a belt faster than anything it seams to me.