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Post by Bruce on Dec 14, 2019 18:00:02 GMT
The Mega V is capable of some really fast traversing speeds. But depending on your production needs you can always program it to go slower.
If you are looking to take advantage of the Mega V speed I'm thinking you may want to mount it lower to the ground to lower the center of gravity. This should help if you're going to use wheels on the feet of the table. The other option is to connect the table to a wall some way.
I'm here to say the Mega V is very smooth and fast and can generate high moments of inertia that can really jerk the machine around. Along with the bench it is sitting on.
I'm predicting a new thread sticky may be needed in the future on the topic of workbench and mounting options for the Mega V.
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Post by btreichel on Dec 15, 2019 15:32:34 GMT
Interesting. Building the bench after the 20th. Do have some 4 x 4's for the legs; but moving into a new building at work, and the old workbenches (old but heavy) could become available. BTW, what are you're ideas about a 'vibration' pad under the machine? I have an old rug under my 3018 that helps.
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Post by kevin16066 on Dec 16, 2019 14:09:13 GMT
The Mega V is capable of some really fast traversing speeds. But depending on your production needs you can always program it to go slower. If you are looking to take advantage of the Mega V speed I'm thinking you may want to mount it lower to the ground to lower the center of gravity. This should help if you're going to use wheels on the feet of the table. The other option is to connect the table to a wall some way. I'm here to say the Mega V is very smooth and fast and can generate high moments of inertia that can really jerk the machine around. Along with the bench it is sitting on. I'm predicting a new thread sticky may be needed in the future on the topic of workbench and mounting options for the Mega V. A new sticky would probably be helpful, there is an unofficial group on Facebook that are all people waiting for the Mega V. I'd love to see everyone's thoughts on reasonable sound dampening as well. Bruce, I was planning on having the total height of the enclosure at about 4' and after Brian told me a 21" clearance for the max Z height that would put the mains bench at about 2' plus the wheels. It's all in my head right now so I apologise for the lack of specifics. I haven't gotten to the sketching phase yet. Is the height around 2' what you had in mind?
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Post by kevin16066 on Dec 16, 2019 14:11:26 GMT
The Mega V is capable of some really fast traversing speeds. But depending on your production needs you can always program it to go slower. If you are looking to take advantage of the Mega V speed I'm thinking you may want to mount it lower to the ground to lower the center of gravity. This should help if you're going to use wheels on the feet of the table. The other option is to connect the table to a wall some way. I'm here to say the Mega V is very smooth and fast and can generate high moments of inertia that can really jerk the machine around. Along with the bench it is sitting on. I'm predicting a new thread sticky may be needed in the future on the topic of workbench and mounting options for the Mega V. A new sticky would probably be helpful, there is an unofficial group on Facebook that are all people waiting for the Mega V. I'd love to see everyone's thoughts on reasonable sound dampening as well. Bruce, I was planning on having the total height of the enclosure at about 4' and after Brian told me a 21" clearance for the max Z height that would put the mains bench at about 2' plus the wheels. It's all in my head right now so I apologise for the lack of specifics. I haven't gotten to the sketching phase yet. Is the height around 2' what you had in mind? And make more videos too lol I watch them over and over. I'm in between machines right now so it's inspiring to watch run!
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Post by Bruce on Dec 17, 2019 2:09:44 GMT
I would think 2ft high would be good. I'm not a mechanical engineer but inertia = mass x radius^2. So looking at the table height as part of the radius in the formula you can reduce the inertia by keeping the bench height less. Extra cross bracing on three or all sides of the bench should also help. If the bench is on a hard floor like concrete a pad or rug would help reduce vibration or scooting on the floor as btreichel suggested.
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scarr
New Member
Posts: 2
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Post by scarr on Dec 17, 2019 3:16:22 GMT
What are the spacing options for the electronics box? The cabling and track/guard thing (yes, I'm new to this) would be the main constraints. (35x35 here)
I've seen pictures of similar CNCs with the box mounted on a shelf under the main surface to make a more compact bench. (Some with shelves above, but that seems riskier, unless it's a full enclosure.)
I'd like to know my design constraints so I can work something up and build it while I wait. (And then build the Mega V directly onto its home base.)
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Post by Bruce on Dec 17, 2019 4:15:38 GMT
The control box is 11 1/8" D x 11 1/8" W x 5" H The cables are routed through the drag chain to the left side of the machine.
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scarr
New Member
Posts: 2
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Post by scarr on Dec 17, 2019 4:24:08 GMT
The control box is 11 1/8" D x 11 1/8" W x 5" H The cables are routed through the drag chain to the left side of the machine. How long is the drag chain? Does the design require the control box needs to sit directly to the left, or how much range is there to move the control box?
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Post by btreichel on Dec 17, 2019 4:30:47 GMT
I would think 2ft high would be good. I'm not a mechanical engineer but inertia = mass x radius^2. So looking at the table height as part of the radius in the formula you can reduce the inertia by keeping the bench height less. Extra cross bracing on three or all sides of the bench should also help. If the bench is on a hard floor like concrete a pad or rug would help reduce vibration or scooting on the floor as btreichel suggested. I actually am, and what Bruce is referring to is moment arm. What this means is that a force on a 3 ft lever (arm) will have a greater effect than on a 2 ft lever. That said I'm taking mine to a normal workbench height and will deal if any issues that MAY arise.
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Post by Bruce on Dec 17, 2019 4:47:12 GMT
The control box is 11 1/8" D x 11 1/8" W x 5" H The cables are routed through the drag chain to the left side of the machine. How long is the drag chain? Does the design require the control box needs to sit directly to the left, or how much range is there to move the control box? It is prewired to the left side. There is only a few inches of range in the cables.
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Post by shauns on Dec 18, 2019 5:59:05 GMT
Will we be able to attach an IoT Relay to control the router on/off?
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Post by Bruce on Dec 21, 2019 6:15:37 GMT
You can use the PWM (SpnEn) with $32=0 Laser/Spindle mode set off in the GRBL settings. If you use the PWM with a laser or spindle control then other configuration will be required.
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Post by kevin16066 on Dec 21, 2019 12:18:29 GMT
Bruce, www.facebook.com/groups/1006388983068312/?ref=share is dying for more Mega V videos of all sorts! It's a group of anxious owners patiently waiting for our deliveries. Brian, thanks for the last update! Keep them coming! We all really appreciate the clear and honest communication. Join our Facebook group too! We're very much looking forward to the assembly instructions to study to prepare for our builds.
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Post by Bruce on Dec 21, 2019 20:35:43 GMT
I'm not much of an FB fan but I suppose I could make an exception for the Mega V.
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hans
Full Member
Posts: 151
Machine: Other
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Post by hans on Dec 21, 2019 22:50:07 GMT
I truly do NOT mean to be argumentative, but I can't figure out why there's an advantage to splitting the Mega V discussion into multiple parts. At the moment, there seems to be this thread, the Mega V comments list on Kickstarter, and at least two threads on Facebook. Why?
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