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Type: Posts; User: MechanoMan

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  1. Re: Can linear encoders be combined with digital step drives?

    OK this is interesting:
    https://www.omc-stepperonline.com/modbus-rs485-closed-loop-stepper-motor-driver-2-1-8-0a-30-110vdc-or-18-80vac-cl86rs
    Has some new features inside

    Two different ways this...
  2. Re: Can linear encoders be combined with digital step drives?

    I have been using AvidCNC:
    https://www.avidcnc.com/support/instructions/components/standard/rpDrive/installation/
  3. Re: Can linear encoders be combined with digital step drives?

    Hey, how necessary is it to have some sort of spring tension on a helical rack vs just static mounting?

    I have a NEMA 34 belt reduction to pinion, but it's just 4 static bolt holes. Seems like it...
  4. Re: Can linear encoders be combined with digital step drives?

    >I would disagree in terms of power. Any servo drive will far out perform a similar size stepper. Yes, the cost is higher.

    More in terms of torque. I have a Chinese 180W NEMA23 ac servo that is...
  5. Can linear encoders be combined with digital step drives?

    I look at the market and high accuracy linear encoders are pretty cheap now

    Steppers are still probably the best option. I do go for the closed-loop variant..

    But I'm looking to counter...
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    Re: Cyclone Dust Seperator

    They're not actually "metric" sizing. sn50 is 2" hose, 75=3", 110=4". By design, they were sized for the corresponding hose ID. China won't list inch units though.

    While it's really effective...
  7. Re: Removing steel screws broken off in spoilboard

    Initially I did state that only brass screws were to be used. However, the brass stripped and busted all over. It's also difficult in that there are many more brass-plated cheap steel screws around...
  8. Re: I smoked my HY VFD a month ago. Here is what happened.

    I started to switch over to those aviation connectors. But they're really not very good TBH. They were never intended to be inline, so one side has no insulation or strain relief. I did about the...
  9. Removing steel screws broken off in spoilboard

    Well, only days after installing spoilboard, someone used long, crappy steel drywall screws and busted one off deep in the table. Head's gone and shank ends about 1/4" below the surface. They tried...
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    Re: Cyclone Dust Seperator

    The Chinese SN series is REALLY GOOD. There's a 25mm, 50mm, 75mm, and a new 110mm. Also one that was like 8mm, but I can't find that one.

    I am certain these parabolic profiles are MUCH better...
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    Re: Holding down spoilboard

    5x8 machine, I already have 2 pcs of cut MDF per layer.
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    Re: Holding down spoilboard

    I did something like that, but it was not good. I used the Raptor nails to hold down the top layer. But, there was an air gap underneath the top layer at some points, which became more problematic...
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    Re: Holding down spoilboard

    Sorry meant to say the supporting frame under the spoilboard is t-slot. Yes it's easiest to bolt a base thickness of MDF from top down and forever bury the bolts, but the layer is unusable...
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    Re: Holding down spoilboard

    Well, the bed is t-slot. What I'm trying to avoid is burying the bolts again that engage the T-nuts like I did on my first rev. If something is adjusted or a bolt loosens, then you are kind of...
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    Re: Holding down spoilboard

    Well how else do you hold down a spoilboard? That's what I'm asking. You don't just lay it on the extrusions. It's not really accurate and surfacing would not help, as it's going to be springy and...
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    Holding down spoilboard

    Looking for different ways to hold down spoilboard. In the past, I actually used nylon bolts buried in the first layer that engaged t-nuts in the t-slot frame. It held quite tight, but was...
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    Inexplicable stepper failure

    I have a new NEMA17 2-phase 4-wire off a 3d printer that doesn't go. I switched it to another verified-good axis drive and it didn't run, this is the motor for sure.

    Here's the thing:
    The motor...
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    Re: Universal Laser VLS3.5

    Yeah aside from the "why is the red dot still on" question, I would just say the tube needs to be regassed. Tube don't usually last 9 yrs without a refill.

    Talk to Evergreen Laser:

    Evergreen...
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    Re: Universal Laser VLS3.5

    So how did you "test fire" the laser before? Were you using the alignment mode?
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    CO2 beam divergence over large bed?

    I am looking at what it would be like to do a large CO2 machine with, say, 4x8 bed and a 150W RECI. And then, for speed reasons, want to see if it's possible to do a fixed tube as opposed to putting...
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    Re: Universal Laser VLS3.5

    There's usually an interlock on the panel over the laser compartment. But there may not be one on a VLS.

    What year is that laser? I think I see "2007".

    The big connector on the ULR-40 laser...
  22. Re: Cost of recharge or replace synrad 30watt co2?

    Talk to Evergreen Laser:

    Coherent Deos
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    Re: Universal Laser VLS3.5

    I have done a LOT of technical maintenance on the ULS systems. But I haven't seen a VLS myself.

    The ULR-40 is an RF laser. It takes in low voltage DC into an RF generator built into the tube. ...
  24. Leadshine AM882H pluggable header sizes

    I need to get some pluggable headers for some AM882H. What size are they?

    There's 2 sizes, the power connections are larger than signal. Pluggable headers come in 5.08mm, 5mm, 3.81mm, and 3.5mm...
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    Re: Cheap 1500W Chinese spindle, experiences?

    A 1HP VFD should have no problem bringing the spindle up to 8K RPM or any speed. Just can't cut super-hard.

    Yes if your v/hz is wrong it will not work correctly. Also the overcurrent point is...
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    Re: Cheap 1500W Chinese spindle, experiences?

    You can't apply Ohm's Law here. The VFD switches against the motor's reactance and creates a more complicated picture than that. The motor resistance is not used, the inductance and back EMF is.
    ...
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    Re: Nitrogen Assist Vs Air Assist

    I did try some low-oxygen air in there as an experiment. Honestly, didn't seem to do anything new. The Air Assist we already had was good at suppressing flame. Wood looked about the same. The...
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    Re: Spindle Idea

    https://www.youtube.com/watch?v=7P5THNNjafU

    Saw this review online of the brushed version. It has massive runout, lacks a double-row angular contact bearing in front (so the shaft has up-and-down...
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    Re: Problems with 5-start leadscrew

    Ideally you don't ever want the drive to go into the mode where it's voltage limited- can't get current to rise fast enough to get the winding to the target current within the duration of the step. ...
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    Re: Problems with 5-start leadscrew

    Well the nature of these drives is it selects a constant-current, it can be the current selected or a fraction based on what microstep you're on.

    The voltage self-adjusts based on what's needed ...
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