MadModder
Gallery, Projects and General => Project Logs => Topic started by: 1hand on January 16, 2011, 12:17:41 AM
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I'm going to build some sorta equivalent of this mount.
(http://i706.photobucket.com/albums/ww62/mrazink/A3/CNCkit.jpg)
(http://i706.photobucket.com/albums/ww62/mrazink/A3/08spiderinstall.jpg)
(http://i706.photobucket.com/albums/ww62/mrazink/A3/09mountinstall.jpg)
(http://i706.photobucket.com/albums/ww62/mrazink/A3/installed.jpg)
Here we go.
Before I started, I thought I would tram my mill.
(http://i706.photobucket.com/albums/ww62/mrazink/009-8.jpg)
...And it was off about .0015
I'm starting with a 2.25" square piece of 6061 for the mount.
First I squared 1 end.
(http://i706.photobucket.com/albums/ww62/mrazink/008-11.jpg)
Then flipped a found the edges and set the tool height.
(http://i706.photobucket.com/albums/ww62/mrazink/010-7.jpg)
(http://i706.photobucket.com/albums/ww62/mrazink/011-8.jpg)
(http://i706.photobucket.com/albums/ww62/mrazink/001-42.jpg)
(http://i706.photobucket.com/albums/ww62/mrazink/002-34.jpg)
(http://i706.photobucket.com/albums/ww62/mrazink/004-28.jpg)
(http://i706.photobucket.com/albums/ww62/mrazink/005-25.jpg)
Matt
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Hi Matt, it looks like there's a rotary table bug going around, seems like everyone want's electronic controls on their rotary table. I take it you are doing this job on a CNC mill? Some pictures of your machine in action would be interesting. I look at your milling out that round pocket with envy, I either put it on a rotary table and turn it by hand, or a four jaw, and turn it in the lathe. That first piece looks pretty good, it's a nice start, you should tell us where you aim to go with this, or offer prizes for proper guessing. Are you developing the electronics yourself, or are you using a package deal? What size table is that, and what worm ratio? Just asking questions as I will be doing my own when I get past the projects already on burners, and the more info there is, the easier it is to make choices. It's good to see a new project starting up with a relatively new member, welcome from North Carolina, :poke: mad jack
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1hand,
I'd advise against using one of these Lovejoy type couplings. They are designed for axial misalignment and when doing these RT's if there is any misalignment it's always radial.
Look at Bog's post on his and use Oldham couplings, they are zero backlash and will handle both radial and axial misalignment. Plus feature is they are often shallower and save more space.
John S.
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A few more.
(http://i706.photobucket.com/albums/ww62/mrazink/003-32.jpg)
(http://i706.photobucket.com/albums/ww62/mrazink/001-43.jpg)
(http://i706.photobucket.com/albums/ww62/mrazink/002-35.jpg)
Matt
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(http://i706.photobucket.com/albums/ww62/mrazink/001-44.jpg)
(http://i706.photobucket.com/albums/ww62/mrazink/002-36.jpg)
Just wiring now!
Matt
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Looks good, like John said though, I also used Oldham couplings for mine.
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You can also fit bearings into this type of table as well, needle rollers and needle thrust, makes them a lot smoother.
(http://www.stevenson-engineers.co.uk/files/rotary%20table3.jpg)
One on the left is original, centre one has had the eccentric shortened down to get two thrusts in and bored for the needle rollers.
Far right is finished and assembles with the oldham coupling half doubling up as lock nut and adjuster.
(http://www.stevenson-engineers.co.uk/files/rotary%20table%205.jpg)
finished and tested.
John S.
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I only use my one occasionally, 4 is just greedy! :clap:
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Boy them are nice!
Down the road, I may have to redo!
Matt
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John S
It looks like you have turned about 8mm off the rear of the eccentric for the thrust washers. That would seem to move the worm outwards by about 4mm from it's original position. I thought it would be a good idea to remove 4.00mm and to counterbore the front thrust bearing by about 3.50mm, so the worm was only out of position by 0.50mm. Apart from more work, is there likely to be any other adverse result?
Thanks
Pete
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The worm position isn't critical as it only uses about three teeth anyway and as long as you are somewhere along the worm thread with full engagement , that's all that matters.
John S.
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(http://i706.photobucket.com/albums/ww62/mrazink/011-8.jpg)
Your hight setter looks interesting.
Made it your self by modding the edge finder maybe?
Love to see the design if so...and othervise as well to be honest. :beer:
/AL
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Video
(http://i706.photobucket.com/albums/ww62/mrazink/th_001-45.jpg) (http://s706.photobucket.com/albums/ww62/mrazink/?action=view¤t=001-45.mp4)
Matt
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(http://i706.photobucket.com/albums/ww62/mrazink/011-8.jpg)
Your hight setter looks interesting.
Made it your self by modding the edge finder maybe?
Love to see the design if so...and othervise as well to be honest. :beer:
/AL
No, an ebay purchase
http://cgi.ebay.com/Z-MASTER-EDGE-FINDER-Z-HEIGHT-SETTER-CNC-MILL-/280612183872?pt=LH_DefaultDomain_0&hash=item4155ca1f40
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is this the same one
http://cgi.ebay.com/PRECISION-ELECTRONIC-X-Y-EDGE-FINDER-CNC-MILL-USA_W0QQitemZ270688430163QQcategoryZ58239QQcmdZViewItemQQ_trksidZp4340.m444QQ_trkparmsZalgo%3DCRX%26its%3DC%252BS%26itu%3DSI%252BUA%252BLM%252BLA%26otn%3D10%26ps%3D63%26clkid%3D6457999442746848815
:ddb: Peter :ddb:
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I think it's the same unit plus a block it plugs into, Peter. Same eller also shows this:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=280615997099&ru=http%3A%2F%2Fshop.ebay.com%3A80%2F%3F_from%3DR40%26_trksid%3Dp5197.m570.l1313%26_nkw%3D280615997099%26_sacat%3DSee-All-Categories%26_fvi%3D1&_rdc=1
For Z-axis setting, couldn't you do much the same with a block of known height, a battery, led, croc clips and a bit of wire?
Andy
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as I am realy stupid , how does the block work ?
Peter
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No doubt Matt will enlighten us, but I imagine it contains insulation between the top and bottom surfaces, so that when the cutter is lowered to touch the top, it completes an electrical circuit via the metalwork of the mill, and lights up a led.
Andy
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No doubt Matt will enlighten us, but I imagine it contains insulation between the top and bottom surfaces, so that when the cutter is lowered to touch the top, it completes an electrical circuit via the metalwork of the mill, and lights up a led.
Andy
Yup, your right. works the same way when you take it out of the block and use as an edge finder.
Matt
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Thanks!
Cost less then expected. :thumbup:
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Hey, Matt, what size stepper did you use (voltage and current).
Chuck
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nema 23 381oz/in 3.5amp 48v
I used the same as my mill and lathe to keep it all the same, but could of got by with a smaller one.
Matt
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Got the 6" RT fixed up today also. Ended up getting a second 5C, to end the hassle of switching between the lathe and RT.
(http://i706.photobucket.com/albums/ww62/mrazink/002-37.jpg)
Matt
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Nice neat job you have done there Matt.
It all makes making machining a little easier and allowing you to do more than you could before.
John
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It was a real life saver today!!!!
(http://i706.photobucket.com/albums/ww62/mrazink/001-46.jpg)
Matt