Don't ad-block us - support your favorite websites. We have safe, unobstrusive, robotics related ads that you actually want to see - see here for more.
0 Members and 1 Guest are viewing this topic.
Watch out because they run upwards of $500+, and not to mention the accesories you'll find yourself buying will run beyond the cost of the intial machine itself... But that aside, this would be something very helpful for people who would have access to them, and even something very good to know.
Very nice, I hope you enjoy your new toy!
Indian old guy wanting to help me figure out why there's a cup holder on my computer Tongue.
Originally Posted By 1Andy2:I know it's hard to see, but there's a slot cut out of this nut, but not all the way through. The bolt running parallel to the leadscrew is so I can close the mouth and slightly bind the threads of the acetal nut against the threads of the acme screw. This takes up any backlash in the system.<a href="http://picasaweb.google.com/lh/photo/pufuGZaxGDRYSXPF701a3g?authkey=Gv1sRgCNzOisKjlNiEWQ&feat=embedwebsite" target="_blank">http://lh3.ggpht.com/_KKSMATVGPec/SVXJPc_wSHI/AAAAAAAABFI/JVH_hO00BmY/s800/IMAG0212.JPG[/url]The home made tap I used to cut threads in all the acetal transmission nuts. Drill press, hacksaw, and files.<a href="http://picasaweb.google.com/lh/photo/7SgGSkIpXpcGUVKelobFgg?authkey=Gv1sRgCNzOisKjlNiEWQ&feat=embedwebsite" target="_blank">http://lh5.ggpht.com/_KKSMATVGPec/SVXJScDSf1I/AAAAAAAABFQ/OnQ7HsVMAPk/s800/IMAG0218.JPG[/url]Ubuntu is great. And I love EMC2. Not just because it's free, but because it's very customizable and very powerful. You should give it a shot.I'm not sure what you mean by conduit... but from the pics, you can see flex isn't really a problem due to the construction of the machine. The rails lie perfectly supported by the chamfered edge of each axis support. As far as the linear bearings go, most all of the stress is from tightening each axis around it's rails, and the linear bearings are nested in either grooves or a shallow cut out in the mdf. Theoretically, I think the MDF itself would prevent the aluminum angle from "spreading" but I don't think I've tightened everything enough for that to happen, anyways.The table is a torsion box made of 3/4" MDF. The rest is just regular MDF pieces, tho I did later add some bracing peices to prevent sag and hold everything square. Everything is good this way, except the spindle holder. The bosch router is simply too heavy for the way things are right now, so the tool hangs down at a slight angle, rather than perpendicular to the table. I'm considering options on how to brace this, but for right now, the machine does what I need it to do.Yes, the router has enough overall power to probably handle steel. The problem is that it's a wood router, designed for high speeds rather than high torque. Yes, it is a variable speed motor, but the way you vary the speed is by lowering the electron pressure (whee, fancy terms!). Less current to the motor means lower speed, but it also means lower overall power. So that 2.25HP rating is only applicable at the highest speed setting. Even so, I think I could get away with machining aluminum.But that's not really what I had in mind for it... instead, I'm going to try my hand at machining some hard foam, use that foam to make silicone molds, use the molds to cast wax models, and then use the wax models to make ceramic cores for aluminum casting. For things. Of a cool nature. We'll see. If it works out, I'll post pics.Anyways, here's some general pics of the whole thing:Drivers, power supply, breakout board, cooling fans and E-stop wired and mounted inside a PC box. This way I can unplug the motors and use this box for another CNC machine like a cnc plasma cutter or EDM or something, assuming I ever buy or build one.http://lh3.ggpht.com/_KKSMATVGPec/SWVCMfa4RYI/AAAAAAAABKs/J09SFkXYbaU/s800/DSC_0260.JPGhttp://lh6.ggpht.com/_KKSMATVGPec/SWVCOY_7MQI/AAAAAAAABK0/mSQ3P2uRRj4/s800/DSC_0261.JPGhttp://lh3.ggpht.com/_KKSMATVGPec/SWVCG32eEsI/AAAAAAAABKk/dj5BVBEgE14/s800/DSC_0259.JPGTorsion box bed. The X-axis has dual rails to accommodate this. Also I suppose it adds stability to the gantry:http://lh5.ggpht.com/_KKSMATVGPec/SWVCcBSrMxI/AAAAAAAABL0/sm3Sdw1n1WM/s800/DSC_0269.JPGLinear bearings nested in the MDF. This is kind of an older shot. The z-axis lead screw in this picture is not 3/8 acme.http://lh6.ggpht.com/_KKSMATVGPec/SWVCQW1jDcI/AAAAAAAABK8/RwHweY4eap4/s800/DSC_0262.JPGhttp://lh4.ggpht.com/_KKSMATVGPec/SWVCSHvy6QI/AAAAAAAABLE/45om_1RrGc4/s800/DSC_0263.JPGAlso an older shot, but showcases what kind of motor couplings I use. 3 part lovejoys couplers.http://lh3.ggpht.com/_KKSMATVGPec/SWVCaPJB8JI/AAAAAAAABLs/1YJf0bQ2Id0/s800/DSC_0268.JPGI've since modified that clunk mounting arrangement to this:<a href="http://picasaweb.google.com/lh/photo/_c8ZvlIX9_fVOvBsy3Iw1Q?feat=embedwebsite" target="_blank">http://lh4.ggpht.com/_KKSMATVGPec/SdJhI8DqfJI/AAAAAAAABXI/4qGVei––17M/s800/DSC_0280.JPG[/url]Wider shot of the machine:http://lh5.ggpht.com/_KKSMATVGPec/SWVCeK9HIAI/AAAAAAAABL8/0bVADBRamks/s800/DSC_0270.JPGAnd here's some upgrades since I took that shot:The heavy bosch router puts alot of weight on the front of the gantry, causing the y-axis rail support board to want to twist, so I added some bracing pieces here. Also pictured is a new y-axis leadscrew (the old one was bent... you would not believe the amount of headaches that caused before I was able to diagnose it) and new, flanged bearings with setscrews.http://lh4.ggpht.com/_KKSMATVGPec/SdJhEPANpyI/AAAAAAAABWo/FUHJZ5jUkY0/s800/DSC_0276.JPGhttp://lh5.ggpht.com/_KKSMATVGPec/SdJhF9n3_0I/AAAAAAAABWw/F7k1uOiVhjw/s800/DSC_0277.JPGThe x-axis bearing support boards I made adjustable, too. The board is vertically and the MDF flange on the bottom of the table is slotted horizontally. In retrospect, I should have just used more flange bearings, for adjustment.http://lh3.ggpht.com/_KKSMATVGPec/SdJhGsgS-hI/AAAAAAAABW4/Vst9aSvu7m4/s800/DSC_0278.JPGhttp://lh5.ggpht.com/_KKSMATVGPec/SdJhHh9MlFI/AAAAAAAABXA/OKNjrW4LKqk/s800/DSC_0279.JPGSome cross-bracing on the bottom of the table to help keep the table from vibrating or swaying. Once I aligned all the leadscrews, to nuts, to motors to an acceptable degree, there was very little of this to correct anyways, but these cross braces take it all out:http://lh6.ggpht.com/_KKSMATVGPec/SdJhKsHh-kI/AAAAAAAABXQ/miJS6QYUqgI/s800/DSC_0281.JPGDon't hesitate to ask more questions trog. If you're serious about doing this, I can help you avoid some of the mistakes I made. Save you some time and money.Here's an action shot:<a href="http://picasaweb.google.com/lh/photo/FC3ZQuPvY7j-4k3RcJAWjQ?feat=embedwebsite" target="_blank">http://lh4.ggpht.com/_KKSMATVGPec/ScBBlikJsHI/AAAAAAAABPQ/Eqyp3hCR_dc/s800/DSC_0275.JPG[/url]
Started by yobomenace
Mechanics and Construction
Started by SeagullOne
Mechanics and Construction
Started by drinu