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Search: Posts Made By: bradm
Forum: General - MM Build Mon 25 May 2020, 15:20
Replies: 1
Views: 55
Posted By bradm
I guess I'll jump in again. Obvious: the...

I guess I'll jump in again.

Obvious: the primary issue here is that anything depending on gravity will have a lot less to utilize. That shows up in holding the car to the gantry, the gantry to...
Forum: Construction started, but not cutting yet Sun 17 May 2020, 09:16
Replies: 128
Views: 70,553
Posted By bradm
I like the way you are headed. I think that if...

I like the way you are headed. I think that if the pan is located at the end of the table, then it can hang off the edge of the spoilboard, and thus a sump can hang down below the spoilboard level,...
Forum: Construction started, but not cutting yet Sun 17 May 2020, 05:55
Replies: 128
Views: 70,553
Posted By bradm
Have you formed a guess as to how much time...

Have you formed a guess as to how much time you'll spend in wood mode, and how much in metal? How often you will switch?

My thinking is biased with the assumption that it's more wood, so I'm...
Forum: Construction started, but not cutting yet Sat 16 May 2020, 20:38
Replies: 128
Views: 70,553
Posted By bradm
A little thinking out loud: In the original...

A little thinking out loud:

In the original design the sub-spoil board serves two purposes: support the spoil board, and add rigidity to the frame. The rigidity may be affected in two ways here:...
Forum: Introduce yourself and start planning Wed 12 February 2020, 09:39
Replies: 6
Views: 1,028
Posted By bradm
I don't have a strong perspective either way on...

I don't have a strong perspective either way on the motors; if they meet the specs given, and the torque curve is appropriate for the acceleration you want, they seem otherwise fine.

The...
Forum: General - MM Build Sat 08 February 2020, 14:47
Replies: 5
Views: 1,611
Posted By bradm
Eeek! It has been that long - plans still came...

Eeek! It has been that long - plans still came from Gerald when I built, and I'm glad this is still going. I look forward to the upgrades.
Forum: Construction started, but not cutting yet Mon 03 February 2020, 06:49
Replies: 128
Views: 70,553
Posted By bradm
I'm with Paul - if you're planning to move it...

I'm with Paul - if you're planning to move it less than once a decade, just get the manpower together to make the move and pull the gantry. In this case you should be able to do that before you wire...
Forum: Construction started, but not cutting yet Sat 01 February 2020, 09:33
Replies: 128
Views: 70,553
Posted By bradm
I think Paul is going for the dimensions of the...

I think Paul is going for the dimensions of the table itself. The gantry hangs over the rails; The rails are the outer width of the table, V-bearing on top of rail + spacer + gantry end + spacer +...
Forum: Troubleshooting Mon 27 January 2020, 14:25
Replies: 6
Views: 1,082
Posted By bradm
That definitely looks like trying to accel too...

That definitely looks like trying to accel too fast on the way back the left to me - you exceed the torque available to the motor, and things get funny from there.

The simplest and most obvious...
Forum: Construction started, but not cutting yet Mon 27 January 2020, 14:14
Replies: 16
Views: 2,747
Posted By bradm
Hi Paul. As you've surmised, for ATC you need an...

Hi Paul. As you've surmised, for ATC you need an area that the spindle can get to that does not conflict with the work area. With the MechMate design, that's likely easiest to do with extra space...
Forum: General - MM Build Fri 03 January 2020, 09:24
Replies: 6
Views: 1,458
Posted By bradm
The MM is alive and well; my dropping in on the...

The MM is alive and well; my dropping in on the forum slowed quite a bit. Unfortunately, by the time I saw the spam there were too many messages to moderate.

Not dead, and I'm reminded to drop by...
Forum: 701. Motor Drives Wed 26 December 2018, 19:48
Replies: 5
Views: 2,096
Posted By bradm
Ger, I suspected the vfd is in forward mode all...

Ger, I suspected the vfd is in forward mode all the time, and the spindle only stopped when the speed was all the way down. Which is what went imperfect.

I have a personal bias against the HY...
Forum: About this Forum Wed 26 December 2018, 19:33
Replies: 21
Views: 9,874
Posted By bradm
Upper couple inches of travel? Makes me think...

Upper couple inches of travel? Makes me think about the compensation strut. It will tend to be weaker towards the top as it extends. Maybe it's a little too weak in spec, or worn?

With power...
Forum: 50. Toolheads Wed 26 December 2018, 19:29
Replies: 4
Views: 2,272
Posted By bradm
( 20 amps into 10/3 is just fine! Under some...

( 20 amps into 10/3 is just fine! Under some circumstances, 30a would be okay; and 20a into 12/3 would be okay. Well done.)
Forum: 701. Motor Drives Mon 24 December 2018, 08:08
Replies: 5
Views: 2,096
Posted By bradm
Are you using voltage control ( 0 - 10V ? ) for...

Are you using voltage control ( 0 - 10V ? ) for the spindle speed?

What hardware is connected to generate the speed control? I bet the output is no longer going all the way to zero, but instead...
Forum: About this Forum Wed 14 November 2018, 16:20
Replies: 21
Views: 9,874
Posted By bradm
Actually, I think that may make sense. So,...

Actually, I think that may make sense.

So, your machine zero is working just fine, as confirmed with your DRO and your manual jog.

But you then have some kind of pre-positioning code ( macro in...
Forum: 50. Toolheads Wed 07 November 2018, 20:03
Replies: 4
Views: 2,272
Posted By bradm
No, you cannot reasonably use 10-3 SO with a 50A...

No, you cannot reasonably use 10-3 SO with a 50A breaker.

Asking to do that does raise some alarm bells, although perhaps not out to electrician level.

The rule of thumb here is essentially to...
Forum: About this Forum Thu 25 October 2018, 20:21
Replies: 21
Views: 9,874
Posted By bradm
Man, I liked it better when we had a single...

Man, I liked it better when we had a single symptom and naive writers <grin>

I'm not a mach3 guy, so maybe someone else can help with that. That red seems likely to indicate we don't have the...
Forum: About this Forum Wed 24 October 2018, 08:21
Replies: 21
Views: 9,874
Posted By bradm
Okay, you've clearly got a handle on the software...

Okay, you've clearly got a handle on the software side, so I will flip to:

- Pinion gear grub screws on rack
- Pinon and rack not meshing cleanly - the Chonk
- - wear on the rack or pinion....
Forum: About this Forum Tue 23 October 2018, 11:38
Replies: 21
Views: 9,874
Posted By bradm
As Mike said, stepper failure is really, really...

As Mike said, stepper failure is really, really rare.

In theory, the lift cylinder balances your Z-axis, so that if the motor is completely removed the Z axis still stays in the same position. If...
Forum: MechMates already cutting Sun 16 September 2018, 16:47
Replies: 448
Views: 137,974
Posted By bradm
That sounds to me like you are getting spindle...

That sounds to me like you are getting spindle noise transferred into your Y axis motor cable. If it were transferring to your limit switches, you should see that in the software effect. It might...
Forum: MechMates already cutting Wed 15 August 2018, 19:01
Replies: 448
Views: 137,974
Posted By bradm
Looks like it will work, it should be a bit...

Looks like it will work, it should be a bit tricky.

On the inputs, I've generally wired to the first and third. Make sure you're over-rated on the inputs by 2/3.

On the spindle output, you...
Forum: Troubleshooting Wed 08 August 2018, 18:46
Replies: 37
Views: 18,239
Posted By bradm
Glad you're solved for now. Onwards and upwards!

Glad you're solved for now. Onwards and upwards!
Forum: Troubleshooting Wed 08 August 2018, 11:12
Replies: 37
Views: 18,239
Posted By bradm
Sorry, I've been away a week. So, "Magic spots"...

Sorry, I've been away a week. So, "Magic spots" in my experience:

- Greater motion resistance due to supply wires, or dust collection. Tends to be nearer the limits, but not exactly on them.
...
Forum: Troubleshooting Thu 26 July 2018, 07:38
Replies: 37
Views: 18,239
Posted By bradm
Um, X80 Y46 is pretty near the limits of your...

Um, X80 Y46 is pretty near the limits of your table, no? So you're pulling the cables farther than at any other time? I'd take a hard look at where the main cable chain transitions to the gantry...
Showing results 1 to 25 of 500

 
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