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Home Model Engine Machinist > CNC and 3-D Printers > CNC Machines and Conversions > another 4th axis...... and a 5th

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Old 04-25-2017, 09:53 PM   #31
blighty
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well that took longer than i thought it would, next thing is the shaft.

random pics.


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Old 07-17-2017, 08:40 AM   #32
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not been in the shed for a bit, but just had to weeks off and its not 32deg in the shed, plus I got a massive fan

few weeks back (before it got hot) i made the shaft for the 4th axis. used the Myford MG12 for the first time in anger. well happy with the results.

have made all the side to the box that holds all the stuff in. turned out a bit bigger than i thought it would, might not as compact job as i first intended. for the 5th axis will have to go for the traditional trunnion type. also had a bit of a problem fitting the stepper. if i had of made the box an inch longer it would of been fine, but had to machine out a lot of one of the sides so the stepper could fit in there. then had the trouble of mounting it.

as i said the box is all made, screwed, doweled in place then squared up. sorted the wiring in the control box and set up Mach. turned it all on, hit the button..................and nothing happened
wont bore you with the details, but 2 hours latter it works


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Old 07-18-2017, 09:27 AM   #33
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started on the plate last night, faced off the back and board the hole for the shaft to fit. plate is 160mm dia. 15mm thick.

to night i will put it on the mill, pick up the 8mm hole and drill the clearance holes so the plate can be mounted to the shaft. once on the shaft, put the assembly in a 4 jaw, clock it up and face of the face and turn down to 160mm dia. then figure out how to hold a chuck on it.

not to sure if i'm going to put T slots in the plate and threaded holes all over the place. might do that at a latter date.
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Old 07-26-2017, 08:08 PM   #34
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it's all up and running
had a few problems mounting the thing to the bed of the mill. in all the excitement of making a 4th axis i some how forgot to build in some way of clamping the thing to the bed as luck would have it there is enough room inside to slide two 12mm threaded rod through the body with a nut on top to clamp it down to the table...... that was lucky. a few things turned out to be lucky with this build. if you lay it down in lets say 4th axis mode the center of the axis is in the middle of the Y axis travel. when used in 5th axis mode its about 5mm of center, so still lots of Y travel, but also when the 5th axis is 90deg the chuck will be just out side the Y axis travel so i should still get all my Y travel.

other problem i thought i would have and ended up with....... the plate that holds the chuck is 160mm dia. the bits that holds on to it (the shaft) is about 50mm. when something is in the chuck you can bend it from side to side and you can see the 160mm plate moving. found a big needle roller thrust bearing. I will fit this between the body and the plate, leaving a few thou on. so when you tighten the plate up it should squeeze the thrust bearing and support the plate on the outside edge.
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Old 08-10-2017, 01:25 PM   #35
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done some more work on the old 4th the other week, machined up the plate to fit the needle roller thrust bearing. thing the thickness of the bearing was about 5.something mil. so i machined to a depth a bit less than that. first to allow for the 0.2mm gap between the plate and the body of the 4th. and a bit more so when you tightened up the plate to the shaft it would pull the plate down onto the bearing.this seems to of taken out all the play that i was getting. so now all you get is a bit of flex in the material it's self. will have to look for a tail stock for long peaces.

as for setting up mach.......
did all the calc's for the step per unit. came out at 33.33 steps per deg. tried this and it never got back to zero it was all ways off. so if you pressed the "zero all" button, the 4th axis would go from 359.999deg to 0.009. zero again and it would go to 359.992 and so on. would never go back to 0. so i started playing with the step count..... this went on for a bit (kinda like this post) ended up with 33.3333333333333333333333333333333. problem solved

just have to think of something to make with it now.
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Old 09-07-2017, 12:49 PM   #36
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This is all very cool
pictures of it on the mill please

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Old 09-10-2017, 06:40 PM   #37
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best i can do for the time being.


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