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Thread: Review - Nova Cole Jaws
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31st January 2007, 04:47 PM #16
hanging by a thread here.....
Got a replacement lower wheel today. Just as much out 0.018"-0.021" which is almost 0.5mm. Basically exactly the same.
The reluctant salesmen put his foot in it when he said "theres no machining of them, they just come straight out of the cast" .......I think they had better check the freaking casting mold over in Taichung Hsien
Ive had enough and I suspect no matter how many replacement wheels I get, I will never arrive at where I want, so I'm sending both wheels off to be professionally trued and balanced by a toolmaker.
I was told by Hafco that 0.018" is not much to be out by 2 people, yet when I spoke to the toolmaker he thinks it is a significant amount.
We will see who is telling the truth and has the knowledge....
If its still got the vibration when its back together, Ill donate some veneer for the monthly prize giveaways .I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones.
Albert Einstein
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31st January 2007, 04:58 PM #17
Well, I hope it DOES solve your problems, Martrix. A nicely-running bandsaw is a thing of joy, but if you have to chase your work all over a bucking table, it sure ain't easy to keep to the line! I guess that's one of the things you pays for when you go up to the bigger models - mine has cast-iron wheels which are claimed to be 'computer balanced'. Wotever done 'em, the saw does run nicely, so I'll count my lucky stars.....
Cheers,IW
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3rd February 2007, 03:27 PM #18
mmm, yum! Anyone want a piece of this humble pie?
Looks like I have to cough up for a give away prize, " Neil?"
The tool maker said that the wheel was not out of true at all, but when I put it back on the shaft and the outside edge was still 0.018" out with a visible wobble. So I don't know what to believe there. No matter what I did, shims washers etc I could not get any reaction either way in the amount of distance that it was out.
He trued up the rubber tyres but they didn't need much work. So back on the machine and the cosmic wobble continues.
I tried mounting the wheel in many different positions, making sure the inner part of the bearing always was re-positioned, but made no difference. I had amazing success with this method for a bench grinder wheel that had a 2.5mm dance going on.
To cut a long story short, the lower wheel is the impetus for the vibration, but the amplifier is the pizz weak base frame for the BP 16A!
I am ropeable that it has taken me this long to find that out. The vertical body is OK, but the problem is with the foot of the machine......All that weight and inertia expected to be absorbed by 2.5mm sheet steel. I know it is the problem because I clamped a steel lintel top/bottom to the closed face and a sturdy block of timber to the cutting side......boom tish! no more vibration I had noticed the machine was easy to wobble and seemed to be top heavy, but never thought that it could cause these vibrations and at no point did anyone suggest this soultion...... until I got Pops the engineer onto it.
I will post pics when rectified.
PS. when I next upgrade, I will search heaven and hell for a big old bandsaw with a solid heavy cast iron body.I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones.
Albert Einstein
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