Okay, I'm back from the abyss. For a week at least!
To warm up I thought I'd share a failure - one of those moments when you've searched for something for so long and finally find an amazing deal and then your brain shuts off. This is me looking for a Burr King.
Since building the Revit bike I have been amazed at the capability of the Burr King three wheel belt grinder - it's not fair to call it a sander as it's far more burly. So I keep an eye on them on eBay where they always go for around 1700-2200 and I have an alert on CraigsList that's never gone off. They are the sort of tool no one sells because they're so damn good.
So a while back my alert goes off for one that's below half the going rate. I call immediately and promise to come pick it up. The guy who's selling it is super nice and between that and my desire to find one for a deal my brain shuts off. It looks all there and when he turns it on I don't even notice there's no belt. He says it needs to be "cleaned up" - the euphamism that should set off all the alarms.
No. Not me, I take it.
It looks all there but it's not. It's missing the tool rests and it's frankly pretty well used up. I was very tempted to take it back after thoroughly going over it. It seemed like everything was worn out, broken or missing. Still I thought it might be able to be rescued.
Surprisingly it worked but it tracked like hell. This pulley sort of explained that.
Yikes. To get this to run smooth it would need to be turned down and crowned. In order for it to turn true it needed to be held by the inner race lands and for that your best bet is an expanding collet that you can machine to the size you need.
Since you're machining the collet on your lathe it will be absolutely concentric.
It was true to a few tenths - which machinists refer to when they are talking about ten thousandths or in this case .0002". This is one of those cases where it's taken me a long time to appreciate english measurement but in this case inches is more granular than metric which only goes to two decimal places for things this small..
I cut a 1 degree bevel on both sides of the flattened wheel. I wasn't sure if it needed it but it's pretty typical for anything that runs a flat belt to have a crown. The crown creates a hill the belt wants to climb and so it keeps it in the middle of the wheel.
The rear wheel wasn't tracking well either as the arm was worn. I made a bronze bushing and sleeved it to size.
And I also cut that wheel down.
Since this machine is older I don't know if it was supposed to have three rubber wheels or not - pictures I find show different combinations.
Then for fun I decided to make a new belt guard to practice my aluminum tig welding. Something I'm still working on.
Lastly was the missing knob for the tracking which I copied from one that was there.
I didn't go down the rabbit hole of stripping it and repainting mostly because I was worried that I'd end up with a very pretty piece of **** that would be a reminder to my haste. As it turned out it works very well now. This is the 1" model - the 562 - and while I really wanted the 2" model I have to say I'm impressed with how well this one works. Grinding the welds on the belt cover was very easy and the belt tracks great.
So that's one small thing that I've done but this is spring in Portland and we are having a glorious week of weather after a very wet winter but I'm back to the house to try to finish the kitchen and get some trim finished.
Ever since Ben told me about a mutual friend who built his own kitchen cabinets but has been without drawer faces for over seven years I've been terrified that would be me. It's been two years so I am making concessions to perfection and I'm just getting it done.
Must. Finish. Kitchen.
Stay tuned for more this week.
Gregor