Thread: 7' X 4' Combi
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02-01-2013 #21
if only everyone could read jazz's comments in the same way!
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02-01-2013 #22
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02-01-2013 #23
Nothing wrong with being load and proud. With the input you are getting Ric will turn out a very nice build. Rome was built together and not by one man (plus a huge amount of slaves)
If the nagging gets really bad......Get a bigger shed:naughty:
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02-01-2013 #24
I have two AC Bearings for the top mount and the Top plate has pockets accordingly 32x10 ID12 and a floating beatring for the bottom. (to suit a 1605 ballscrew) each half of the channel is 40x20mm so that should be enough... I think..
This is the ballnut i will be using although im open to suggestions, If you think a better one could be used.
RickAlways bear in mind that your own resolution to succeed is more important than any other - Abe Lincoln
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02-01-2013 #25
All it needs is at one side of each set of bearings to have the side of the pocket line up with the edge of the bearing, so the bearing or rail Butt's upto it.
So IE: On the Z axis have say the left bearings align with the pocket edges, same with rails on Left side. With the Y axis have the upper Bearings align with upper pocket edges, the rails you'll have to deal with on the Gantry but same applies a straight and true Register helps.
The rest of the pockets can be any size so long has the bearings and rails fit inside and infact a bit of wiggle room helps.
Ye thats what I feared.!! Don't do that it's too inflexible.! "Adjustment" "Adjustment" "Adjustment" is the secret to the whole machine and Esp the setting up of the Z axis and ball-screw alignments.
Ask anyone who's done it the difference between working and locking up is silly small and if you haven't got easy or multiple ways to adjust then life will be frustrating.!!Last edited by JAZZCNC; 02-01-2013 at 06:38 PM.
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02-01-2013 #26
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02-01-2013 #27
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02-01-2013 #28
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02-01-2013 #29
Rick,
With that ballnut a good bit of the issue with lubrication is mute BUT still make sure you have access. I also see why you want to keep in near completely enclosed as that nut does not have protective flanges for the ball races. Therefore the less chance for swarf to get in the better.
Speaking from experience of a a design done with Jazz and he built for me and I have worked on a good bit and have had to lube and put shims back and all the fun that goes with it, listen to Jazz. Now hear is where I get to make a point a bit clearer. Lubrication is not just the ball nut. Those linear rail carriages are going to want a greasing once a quarter if you are using that machine with a daily use level (that is even with the protective scrapers).
Personally for myself I am setting up a bit of over kill as I am designing a lube system for my current machine that will be a lube block for X, one for Y and most of Z and a single lube point out the front of the Z plate with a cap for the ball nut.
Registers made setting up my machine take two days instead of a week ( even though it came up here in two heavy large sections it still needed squaring, truing and tramming. A side note to folks, tramming is something you should check once a fortnight to once a month (depending on how heavy your use is and what your cutting). My source for this information is a few friends back in the states that are having fun laughing at me stumbling along and learning (They are both 20 yr plus machinists and High School "friends" ).
You have a really nice design and with just a bit of adjustment it will not only do you proud as a finished build (ha, a machine is never finished), but the quality you put in and care to detail in the build has a direct result on the out come you get. I mean heck with the power supply I finally built and installed for my machine I am running acceleration level in scary land with rather nice rapids. When I get the feeds and speeds right (which is getting more often) I am getting wonderful finishes. Keep it up, doing good.
Michael
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03-01-2013 #30
Cheers Michael, that ballnut as you say has no flanges, but that too is being worked on he (wink), worst case is I have to open up the channel by 6mm each side and fit a conventional or threaded ballnut, and I may go that way in the end purely for simplicity of duplication and security of the balls!!. I too am toying with the lube question, My Boxford has a lube system that looks after things and I'm thinking of fitting tubing directly to the bearing blocks, although for the moment I will be drilling lube ports in the plate and have left enough room to access the nipples that are fitted to the bearing blocks, the orientation of the blocks when fitted will allow them to be lubed without too much fuss, the bottom ones from underneath when the z is fully up and top when the Z is fully down. The Y axis will be accessible by lining up with holes that will be in the gantry itself, they will be covered when not in use. From Friday I will be tinkering with the design to take account of the Registers. Out comes the Vernier again!! LOL but its so worth getting it right.. Rick
Always bear in mind that your own resolution to succeed is more important than any other - Abe Lincoln
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