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Need Help! steppers vs servos

November 7, 2017, 3:34 am
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I understand the basic differences between a servo and a stepper, but in a CNC application, what benefits do servos give?

I notice that a 750w servo has quite a modest torque (2.4Nm), so you clearly need quite beefy PSU's and drivers.

Obviously the servo is closed loop so there are no missed steps, but theoretically you can have encoder equipped steppers to address that issue. (not sure how well that works in practice?)

I assume that servo positioning accuracy can be better, as the encoder will be much better than the 200 steps per rev on a stepper and there's no loss of torque compared to a micro-stepped stepper.

Are servos worth the extra costs, assuming you don't have C3 grade ballscrews???

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Need Help! How to make sure that both spindles are aligned! “ 2500/1250”

November 7, 2017, 4:17 am
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Hey folks,

I got Mori Seiki lathes 2500/1250 which has main spindle and sub spindle and I'm wondering how can I check both of them are aligned? I want to get the sub spindle on center with the main cuz Im not sure if they are aligned or not.

If you know how to do that I would appreciate your help.

VR,

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RDQ - 2.5in Titanium Discs

November 7, 2017, 5:13 am
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I'm looking for a quantity 5 of a 2.5" round disc x 0.25" thick with a 0.030" chamfer on both faces.

Outside diameter should be a fine finish approx 32 or better (will not be tested unless questionable).

Both faces should be an ultra fine ground (appearing, 16 or better) finish. They can be face turned but no tit is acceptable. Grinding is preferred if possible.

Titanium grade not important.
Overall diameter and thickness tolerance is +\- 0.025"

Please only email me as I likely won't be able to check this often. Stizzit@gmail.com

Thanks
Rob



Sent from my iPhone using Tapatalk

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Ideal bit for M D F/Veneer?

November 7, 2017, 5:36 am
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Seen lots of debates about which is the best bit for mdf.

I find 2 flute 6mm upper cut reliable, but leaves a fuzzy edge at the top edge. (And I hear Down cut does same to bottom edge).

Is a straight single flute a better option? Will it plunge as well?

I have made a small table and its a pain sanding the edges after cutting. Want to know for future projects.

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Seeking Experienced CNC Router Operator (MACH 3 Software) in South Florida Area

November 7, 2017, 12:19 am
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Seeking Experienced CNC Router Operator (MACH 3 Software) in South Florida Area


Our CNC Router is using MACH 3 Software.
Please contact hytechpowerllc@yahoo.com

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Need Help! Aligning sub spindle to main spindle? 2500/1250

November 7, 2017, 3:42 am
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Hey folks,

I gotMori Seiki lathes 2500/1250 which has main spindle and sup spindle and I'm wondering how can I check both of them are aligned? I want to get the sub spindle on center with the main cuz Im not sure if they are aligned or not.

If you know how to do that I would appreciate your help.

VR,

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Coolant choice

November 7, 2017, 7:16 am
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Hello all

What coolants are you using in the:

1. Slantpro lathe
2. Mill flood coolant
3. Mill misting coolant

Thank you

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urgent help required Huanyang Inverter.

November 7, 2017, 7:31 am
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Hi there guys, have an urgent request for information.

I fired up my inverter just now to set all the perameters ready for our kuka robotic arm comitioning tomorow and the inverter is doing something strange and cant find a reason.

upon power on the power light lights and the screen just displays "8." that is it the cooling fan spins and that is it.

i had the thing powered up correctly as per the manual only the other week and now it is doing this any ideas what i could be, im going to check fuses and power conectinos but apart from that im on the dark with little experience with these units

hope some one can help!

regards
chris

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Need Help with SL-253 BMC

November 7, 2017, 8:05 am
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Hi Guys,

i have a Mori lathe with a C axis and live tools the mapp unit got corrupted and the Mori tech said that the MSG-501 control needs to be replaced ($7,000). i send the unit to be repaired and they didn't find anything wrong with it except they replaced the real time battery.
the machine loads up to Tiny os 2 and then freeze and will not go anywhere. i wanted to know if anyone knows a lab that repairs the control? also if anyone has the same machine it would be great if i can get a back up as mine was corrupted in the process. im at my wits end with the mori guys they are just such a crappy company to deal with. i will never ever ever buy a mori seiki again after this experience.

Any help will be gratefully appreciated.

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Truck Spacing

November 7, 2017, 8:28 am
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I am using some CNCROUTERPARTS stuff, but my frame is 45 series rather than 40 series extrusion. I am interested in the outer end to outer end truck spacing on the standard Pro parts. For both the x and y axis. Thanks for the help.

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HELP WITH MACH3 MILL

November 7, 2017, 8:37 am
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Hi guys... anyone uses mach 3? Newbie here and I need help on the program. Had this installed a couple of years back and was getting back into it recently. On the Mach3 Mill home screen, I clicked on the button "SIMPLIFY SCREEN" and this happened... can't find how to bring it back to the default screen. The TURN and PLASMA screens are OK... except for this... bummer



Attached Images
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Hello

November 7, 2017, 8:45 am
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My name is Robin & I'm an Instructor at SAIT (Southern Alberta Institute of Technology).
We're in the process of setting up a MakerSpace here and I've heard very good things about this forum.
I'm hoping to be able to learn and share with others.
Thanks

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Which milling would you recommend, and why ?

November 7, 2017, 8:55 am
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Hi Folks,

I'm currently shopping to get a small milling machine. I won't need to create big pieces: it should mostly be in the 8"x5" range, mostly aluminum or brass.

I will definitely convert this machine with stepper motor: I have built my own CNC table, so I should be OK. I also have access to a buddy that has an automated milling machine, so making the motor's bracket should be fairly easy !

So far, I have 3 choices in mind. Being in Canada, the choices are a little limited: custom fees, exchange rate and shipping will ruin any good deal from the states !

These choices are:



Pros and cons that I have sorted out so far.

KC-20VS:

+ 1 HP motor
+ 90 Deg Tilt L/R
+ work size of 19x7x13
- Motor only 4.8 amps...seems a bit low !
+ Conversion kit easily available and well documented

CX611:

+ 1 1/4 HP motor
+ Tap mode
+ 3 yrs warranty
- Price
+ decent work size of 16x6x12
+ Conversion kit available and somehow documented

CX600:

+ Price
- Motor only 500W (even if they claim 3/4HP)
+ 3 yrs warranty


The rest of the specs are somehow similar : DRO, T-slot, etc ... They all have some tilting capabilities, but I don't know how much of a feature that is ?!

Right now, I'm leaning toward the KC-20VS mostly because of the price. The CX600 seems the least appealing, despite the low cost, mostly because of the 500W motor. But on the other hand, the local guys that sells the Craftex are WAY MORE knowledgeable the the ones that sells the King ones. I do value proper advise and knowledge when it comes to buy that kind of tool !


What would you choose and why ?

What features should prevail over others ?

Have you had bad experience with any of those ?

Feel free to add/remove from my pros/cons list.



Thanks all !


On a slightly different subject, I've seen that a couple of conversion, were also changing the screws for ball screws. Is there such an advantage to do so ?

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Looking for post processor Mori Seiki SL-253 bmc Lathe live tools and C axis

November 7, 2017, 9:39 am
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Hi There,

does anyone have a post for this machine i work with Fusion 360

Thankyou.

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North America Edmonton area: CNC rails for sale

November 7, 2017, 9:54 am
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Hey Folks,

A little while back, I have built a wall saw, using some CNC rails.

Turned out I did not used it as much as I thought I would, so I have dismantled it.

So now, I have these rails for sale:

  • 2 x 20 mm x 9FT, with (at least) 4 linear bearings
  • 2 x 16 mm x 5FT, with (at least) 4 linear bearings



if anyone is interested, give me a call at 780-906-5345

Ciao !

Jasmin

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Emco Turn 55 Spindle motor LENZE 8200 VFD Inverter help

November 7, 2017, 10:19 am
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Dear all

Hope someone can help.

My Emco Turn 55 had not been used for over 5 years. I finally got round to starting it. When executing a cutting program, the XZ and toolchanger all worked as programmed but the lathe will give a high pitch whine that last for maybe 1-2 seconds or so and then an error message pops up to say "no main spindle speed".

I took out the back panel to check on the Lenze 8200 Inverter Drive. When I switch on the PC Turn, immediately the Lenze Inverter Green LED started blinking and continue to blink nonstop. It will go solid green when it tried to execute the M3 code and whine. Once the whine stopped, it goes back to blinking.

I downloaded Lenze manual and it said that it could be "Motor parameter identification being executed" or it could be "Controller Inhibited". I am not sure what either of that means. Could it be that the spindle motor parameter has to be reentered into the Lenze because the memory for the spindle motor was lost?

Any help is greatly appreciated.
frank

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Need Help! Feeds and speeds fiber cement sheet

November 7, 2017, 10:31 am
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Hello everyone
Plz recomend bits,feed and speed for cutting fiber cement sheet as well.
Thanks in advance

Sent from my Redmi Note 3 using Tapatalk

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Just In Cutting fiber cement sheet

November 7, 2017, 10:37 am
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Bits,Feeds and speeds for cutting fiber cement sheet

Sent from my Redmi Note 3 using Tapatalk

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Hardinge HC Chucker Lathe Spindle Bearings

November 7, 2017, 10:39 am
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Hello Guys,
I purchased a Hardinge chucker lathe and found out it needs the spindle bearings replaced, has anyone ever done this on here how hard is it and what are the part numbers for the bearings beside going to Hardinge for them

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Build Thread CNC 6040 - upgrade to KFLOP

November 7, 2017, 10:58 am
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Well...

This is my workbench



The machine



The plate



Electronics



Power Supply with Controller and Stepper driver



The cheap CNC board Controller



Do not take care of ugly look. This is just a experimental prototype.

My target is make PCB board for little production, but the cheap CNC Controller have some problem...

With Mach3 at high speeds (but not so much ...) the controller go to a irreversible loop, moving the axis back and forth in a little loop.

Due of this I had to throw away a lot of PCBs. So I decided to upgrade the board with a KFLOP board.

In this thread i walk through the project, step by step.










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