PM-25-MV (BF L Type) Conversion / Mods

[Mad Welder]

By "knocking out .0001", are you saying that you machined it? How did you do that accurately?

I think photomankc referred to that measurement in his previous post of maybe polishing off the 0.0001"

[LUCKY13]

Seems to me that you would want the upper bearing to be more of a slip fit, this way it could move on the spindle when it grows, thus retaining a more accurate preload. It sure would be easier to get a better preload if the bearing could slip, simply making it that much easier to hit that happy middle ground that would hold the preload no matter how much thermal change there was.


IDK, maybe its alright if you hit the right spot with it being a press fit. It does seem it would be harder to do so.



Jess

PS- polishing with emory would be a easy way to remove metal if needed. Just need to be carefull and keep it even so it keeps the surface straight.

[Mad Welder]

Seems to me that you would want the upper bearing to be more of a slip fit, this way it could move on the spindle when it grows, thus retaining a more accurate preload....

You know that makes good sence.....thanks!

[photomankc]

By "knocking out .0001", are you saying that you machined it? How did you do that accurately?

Exactly as Madwelder indicated. I used 220 grit sandpaper and then finished it down with 500 grit. Came off like a mirror. I used a mic to read the journal diameter took readings till I got 3 that agreed completely. The shaft is quite hard so it took a lot longer than I expected to get that tenth removed. I stopped there because the new bearing would just start to go on cold but would not slip on.

[photomankc]

Good to hear. Now get me my parts

Nah just kidding take your time. You'll notice over time the spindle will run cooler as well.

Well good grief man..... you'd think you'd paid me to do it or something.


Should be getting that job going tomorrow actually.

[Starleper1]

Oh yeah I guess I forgot the green stuff.

Coming at ya...

[photomankc]

Just to follow up on the bearings I have to say that if you have one of these machines and start having heat issues you might look at regreasing and resetting the pre-load. The difference here is amazing. I don't know how much the Kluber uber grease contributes but these TR bearings are now running under 100 degrees for extended runs. I have no doubt you could get another thou or two of RPM of these like this. I double checked the runout again and it is the same as before, less than 0.0005 is about the best I can measure it can't be totally certain how much less.

Heat is no longer a concern.


I also added this to replace the little 7gal Hotdog tank. 15Gal at 200 PSI runs the mist system now for 6 to 7 minutes and takes 1.5 minutes to refill. The old one ran it for 4.5 minutes and took 2.5 minutes to recharge. It's a little quieter too. The old Craftsman compressor quit on me. Think it blew a gasket somewhere as there is air just pouring out of it when the pump is running.

[Starleper1]

You can't go wrong with DeWalt. All my power tools are DeWalt.

[Mad Welder]

Hi there have you any update or any new parts machined?

[photomankc]

No sir, between the electronics work on the robot and this being my backpacking season there has been next to nothing done on the mill since the end February. I plan to tackle the electronics enclosure this summer and after that maybe some sort of one-shot lube.

It has been drilling circuit boards lately quite nicely and for that I am most pleased to have the extra RPM. Could use another 10 or 20 thousand though. That may be a mod I could look at making. An aux drilling/engraving spindle.

[photomankc]

I know this is a bit off topic but.....

The "Shed to Shop" conversion has begun. This building has been nothing but a den for squirrles and spiders and this year I want to change that. Convert it into a proper back yard workshop. I'm hoping to bring out seperate electrical service to this buidling so that anything I'd be interested in putting out there will have plenty of juice. I hope to someday have a Tormach 1100 living there so 220 should be availible.

If I can't get a seperate meter out there then I have to try to get 40 or 60 amp service from the house to the shed. My panel seems to be 100 amp. I'm not to schooled on home electrical wiring but I guess I'm going to have to learn up on it.

I want seperate 15 amp circuits for the Mill and Lathe. 15 for the electronics and computers and one or more for the rest of the tools and lighting.

Going shopping for windows at the surplus stores tomorrow and need to get started on getting a permit and yard marking. I think this is going to be a kick-butt little shop for me and I'll be happy when I can finally put all the shop tools from the garage and basement togehter in one location.

I got all the rat-chewed shelving out today with the help of the implements of destruction. Loaded the garbage into the pickup but it's going to take several trips to get the crap all hauled away.

[photomankc]

The work on the outdoor shop continues. I have an estimate now for a 60A run from my home breaker panel with cable large enough for 100A for easy upgrade later on if needed. I'll have to do the trench to keep the cost down a bit. Will have individual circuits for all the major machine locations.

Since there isn't much progress on the electronics (still looking around for a good reasonable NEMA box) I thought I post up the latest video of part making on the machine. This one shows the mist coolant system running on the new 20G compressor. I get around 6 minutes of operation before the compressor cuts on for about 2 minutes. Sorry on the shakey-cam... I didn't feel like fooling with the tripod for the real vidcam.... just the iPod camera here.

"http://www.youtube.com/watch?v=2VCsqyuGpYE"]ProwlerBot Rear Wheel Bracket.wmv - YouTube

The little robot I'm working on continues to be transformed from the kluged together prototype to a nice working design thanks to my little machine.