#91
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Anil I don't think you need to do any to the overhanging rails. My next machine will overhang about 4" with no support. J.R.
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#92
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I agree with J.R. - those overhanging rails are really not a problem.
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#93
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Gerald it's too late for me to do that now when all my friends hear from me what a nice guy you are. But speaking seriously grinder could become a very dangerous tool when you are thinking at something else during the cutting process.
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#94
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OK, then I'll go ahead and round and deburr the sharp corners/edges pf the rails and let them overhung.
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#95
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Sorry, I didn't know. Will be tracking your progress. Very eager to see the machine working.
all the best again. Pady |
#96
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Z-slide done
Doing z-axis worked out to be most time consuming for me, most time gone towards beveling z-slide plate. Then there was a wild spider so it has to go under the cutter
wild-spider.jpg spider.jpg And the z-axis test assembled, I am sure everyone is going to shout at me for another mistake ? Rack holes on wrong side of plate. Anyway after drilling another 2 holes for rack I will put dummy screws on these and the screw pattern will look symmetrical OR can i simply use tape ?? z-slide.jpg And it started looking familiar loosly-assembled.jpg And nobody is going to comment on my ugly weld or I'll stop posting pics |
#97
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Almost there
Hey your almost there! soon you will be making chips fly and dont worry you always have to break a few eggs to bake a cake. It looking good.
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#98
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Thanks Castone, The major part now (the part left is always major one) is finishing it all. All the deburring/cleaning/grinding/painting is a time consuming and never ending part
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#99
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Hey Anil,
you have made nice progress with your build! Don`t bother about bad welds, but never post anything with Led Lights... Greetings Claus |
#100
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Claus, Thanks for the warning about lights
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#101
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Belt drive plates joined today, ready for assembling after painting. Looks crude and not pretty as CNCed Alu. plates but I prefer weld over bolts somehow !
belt-drive-weld2.jpg |
#102
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Quick and sloppy paint job
p-table.jpg p-table1.jpg p-gantry.jpg p-motor-plates.jpg p-spider.jpg p-ycar.jpg p-zslide.jpg |
#103
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Mechmate is all over the place, Anil. Can see how u r enjoying the progress. All the best.
Pady |
#104
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Pady, Much fun still remains as it gets assembled and the electrical / electronics part done, so hurry up and pack up if you don't want to miss all that fun
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#105
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Getting closer :)
Aligning the
Using a thread, first fixed the point that were correct and then pushed or pulled the rails where miss aligned. Pushing the at one point using clamp was simple pushing.JPG Pulling the other way required more clamps pulling1.JPG pulling2.JPG pulling3.JPG pulling4.JPG Then draw filed the points as needed and finally straightened and smooth using V block and sand paper. sanding-block.JPG Checking and it passes (my criteria being not so stringent as others here) checking.JPG All Gantry wheels seems to sit without gap over the travel except 0,0 corner because rails is sharply bent and clamps doesn't seems to work on correcting such sharp bend. seating1.JPG seating2.JPG And Gantry riding on rails... x-done.JPG Now moving on to Y rails, hunting for holes in clamp strip.. locating.JPG Its late today so final alignment of y-rails be done tomorrow, just a pic of y-car riding the (yet to be aligned) rails. y-done.JPG Partially assembled the belt reduction plates, pulleys on all of them are smooth, that's a great relief belt-drive.JPG By the way, had to undo and assembled these twice as I forgot to insert the belts first time. Anyone doing belt drives, don't repeat my mistake |
#106
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Anil
You did a great job so far. Looking goood |
#107
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Thanks Claus, I wish my build was as good as yours but as you can see I don't have patience like you
Look, I painted without even welding stop blocks, proxy, chain mounts etc, and I am sure I must be missing many more such things... Last edited by aniljangra; Sun 13 December 2009 at 14:08.. |
#108
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Look, I painted without even welding stop blocks, proxy, chain mounts etc, and I am sure I must be missing many more such things...
What seems to rush you... Make sure you at least have stoppers ( Stop blocks ) |
#109
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I also did not paint the last 10 inches of the rails to have my stop blocks welded at last. I wanted to get most travel so I waited with them until to the very last, to check most travel.
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#110
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I don't mean to eliminate the stop blocks or proxies, Its just that I thought "the welding work is done so lets paint it ".
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#111
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Control box for sensors/buttons
My solution for connecting the sensors and buttons to BOB is to feed all the inputs to a control box riding on gantry (as discussed in past on this forum). Already drawn schematic in Eagle and doing the PCB, here is the rendering of the board (checking the size that can fit all those connectors )
Top edge there are 8 connectors for sensors, left edge is the power connector, right side the LEDs and bottom edge the connectors for buttons, probes and output to BoB) Circuit diagram is also attached for someone to have a look at, I tried to keep it as simple as possible cntrl-avr.pdf cntrl-avr.jpg Please (everyone ) suggest if something is missing or not correct : 1. Take inputs from 8 NPN proximity sensors and combine them in one output to BOB. Four of them can be Home and other 4 Limit sensors. As all the inputs are ANDed, as many as required can be used and all other inputs can be left unconnected. 2. Eight LEDs to show the status of which one triggered the output. LED will be latched till reset. 3. Take Inputs from all three button stations and combine them in output to BOB. On each station there are 3 buttons a) Estop, b) Pause/Resume, c) Z-zero (we only need one button for Pause and Resume, though the controller will send output to 2 seperate line to BOB depending on the current state). All buttons are NO type 4. Take input from Touch plate (Active low) and Touch prob (Active high) and combine them together. ( As I haven't yet worked with Mach3, I am not sure of this combined probe/plate output can be further combined to the output from proxies or it need to be seperate output to Bob, please suggest ?). Anyway this is not going to affect H/W and can be changed in code anytime. |
#112
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hmm need only three proximities to act as limit and home switches, on my machine I use only 3.
there is only one signal required for the Z tool zero probe, |
#113
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Ok, I'll reduce the number of proxy inputs to 4.
Also while browsing thread on this topic I found the answer to my other question "Z-zero can be combined to other inputs ..." So now there will be 2 inputs one N/O and one N/C from Probe/touch plate and there will be no separate output ( these will be combined in series with the output that is used for proxies). Also noticed that there need to be an option for a seperating one of the output from X proxy for auto squaring, so there will be a jumper for this selection. So now a smaller chip can be used. I'll draw a new schematic today. Thanks |
#114
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I am Hari pradeep from kerala India.Can you give me prices for Hong Kong motors and drives if you are importing for me
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#115
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Updated as :
- Number of proxies reduced to four. - Jumper added for routing one proxy output to separate pin for auto squaring. - Probe output combined with other proxy outputs. - E stop is directly routed to BoB input, other buttons goes via controller. - Smaller chip and smaller board. Here is placement view, next to route the PCB and program uC. cntrl-avr1.jpg Suggestions are welcome as I usually rush and miss things Already got one suggestion to take thermistor input from spindle for early warning for high temperature before VFD shuts it down due to overheating, thus the work can be paused and resumed later. So saved one pin on controller for that, now searching for thermistor specs ?? (don't have spindle yet). I guess its some kind of NTC !! |
#116
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Got some missing electronic parts for drives and fixed heat sinks. All of them tested good with motor attached. As small parts of kitchen table project sort of went well. . I made 6 of them just in case i blow up one or two dring testing but it all went well.
drives-tested.jpg |
#117
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looking forward to see them zip zap and zoom the mechmate
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#118
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Anil, respect. You are a real electronics Guru.
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#119
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Claus, making few circuits don't make you guru
Moving on to MM, the pic shows the way I managed to get rails seated on those twisted gantry tubes, as shims were not working I laid some welds on top of tubes across the length and using tightened wire, level and a flat slab grind off the high points. twist1.JPG Just to add, the rails were removed and then the welds were laid on top of tubes. |
#120
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