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  #541  
Old Fri 21 November 2014, 22:43
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Nice job Alan!

(Do you know about Cape Watchmakers' own parking bays?)
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  #542  
Old Fri 21 November 2014, 23:12
Alan_c
Just call me: Alan (#11)
 
Grabouw (Western Cape)
South Africa
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Thanks guys.

Hi Gerald, yes thankfully, parking anywhere else in that area of town is always problematic.
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  #543  
Old Sat 22 November 2014, 11:09
pblackburn
Just call me: Pete #98
 
South-Central Pennsylvania
United States of America
Beautifully done.
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  #544  
Old Sat 08 April 2017, 08:38
Alan_c
Just call me: Alan (#11)
 
Grabouw (Western Cape)
South Africa
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Machine doing crazy things.

Hi guys, need some help here. The machine has started doing some weird moves. See attached pic. That was supposed to be circular text on a round disk with a recessed centre. As you can see the text looks fine on the first one, but from there it just gets progressively worse until what is supposed to be the profile cut is completely wonky. I am not at the machine, my foreman sent this to me. Apparenly there is no slop or loose mechanical connections.
I suspect it could be the pc giving up the ghost or a software issue (mach 3)

Has anybody experienced any thing similar?
Attached Images
File Type: jpg IMG_20170408_163712.jpg (72.4 KB, 207 views)
File Type: jpg IMG_20170408_163638.jpg (106.7 KB, 207 views)

Last edited by Alan_c; Sat 08 April 2017 at 08:46..
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  #545  
Old Sat 08 April 2017, 20:52
lonestaral
Just call me: Al #114
 
Isarn
Thailand
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Usually something simple.

Mechanical.
Check all grub screws on pinions and reduction drives.

Electrical.
Check all wiring and connections to motors and circuit boards.
Dust in computer and control box.
Static, throw a bucket of water on the earth spike.
Parallel port cable.
Probably think of some more later.
Good luck.
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  #546  
Old Tue 11 April 2017, 14:56
smreish
Just call me: Sean - #5, 28, 58 and others
 
Orlando, Florida
United States of America
Check the z axis eccentric vee bearings too.
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  #547  
Old Thu 13 April 2017, 04:38
Alan_c
Just call me: Alan (#11)
 
Grabouw (Western Cape)
South Africa
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Mechmate 11 is now sorted, the one thing that I asked my operator to check (as I wasn't at the machine at the time) was for movement on the pinions, of course he assured me it was perfect...well it wasn't. The two grub screws fixing the driven pulley to the pinion shaft of the belt reduction were completely loose . two minute repair, after spending 30 minutes checking all connections, blowing out the electrical cabinet, cleaning intake filters etc etc... (at least the machine got a good service)
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  #548  
Old Sat 15 April 2017, 03:35
lonestaral
Just call me: Al #114
 
Isarn
Thailand
Send a message via Skype™ to lonestaral
That's a solution that I like to hear, simple and cheap.
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  #549  
Old Sun 16 April 2017, 03:00
Alan_c
Just call me: Alan (#11)
 
Grabouw (Western Cape)
South Africa
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It just goes to show once again what a robust design the MechMate is. I noticed some posts earlier in the week on an FB group questioning the design of the MM and the fact that nothing much has changed over the years - thats a good thing, constant changes mean constant new problems to solve. The MM design is stable and well proven, dont fix what aint broke (unless you broke it yourself )
Sure if you want to spend the cost on fancy expensive linear rails and recirculating ball nuts and screws go ahead but its really not necessary. My machine has been running virtually problem free since 2008 and whatever problems have come up have been simple and easy to fix. I know for a fact that expensive bought machines (whether from Europe or the East) will require a lot more expensive maintenance and call outs from an even more expensive technician and boy when something fails it costs big bucks. Some years back a NUM controller on an SCM machine at work failed, the repair (not replacement!) cost more than my entire MM cost me.
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  #550  
Old Sun 16 April 2017, 09:21
hflwaterski
Just call me: Herb #126
 
Genesee, WI
United States of America
I agree. Based on what I'm reading about the latest DIY CNCs, I wouldn't change the mechanical design at all. Some electronics and software will always be in a state of constant change and that is to be expected. I probably don't run mine as hard as others do here but I'm very pleased with it so far. Glad to hear your problem was sorted as easy as it was. It makes one stop to think about checking the basics first.
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  #551  
Old Mon 17 April 2017, 09:22
silverdog
Just call me: Sergio #70
 
Rome
Italy
Hi guys :-) ... same old story on the v-wheels against linear guides :-) I remenber and understood what Gerald pointed out once ... Linear guides are much more complicated to mount, if you don't get them perfecly aligned on 3 axis they are going to work badly, I think he told that you need a perfect base (rectified - grinded) to make them working properly or at least a lot of patience :-) ... well somthing like that
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