On Mon, 20 Jul 2020 at 02:44, Tom Smart wrote:
> The motor is this glentek GM4040-41 180vdc, 9.1A. I decoded the serial number
> it has no brake, no tachometer, a special encoder, no resolver.
Just how special is the encoder? Everything else sounds like a simple
retrofit, DC servos are relative
es and there are wires in the servo where the
encoder was likely connected.
I will continue pecking away at it trying to figure out what i need to bring it
back to life.
From: andy pugh
Sent: Monday, July 20, 2020 2:49 AM
To: Enhanced Machine Controller (EMC)
Subje
ce,
Thomas
From: andy pugh
Sent: Monday, July 20, 2020 2:49 AM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Need help with Bostomatic BD18-2 to linuxcnc
On Mon, 20 Jul 2020 at 02:44, Tom Smart wrote:
> The motor is this glentek GM4040-41 180vdc, 9.
On 07/20/2020 09:00 PM, Tom Smart wrote:
I forgot to ask how would I calculate the loss of abilities of the mill if i
don't drive the servos with their maximum rated power and amps? If I were to
get drives that weren't rated to 180vdc what losses will i have and how do i
calculate the loss?
Controller (EMC)
Subject: Re: [Emc-users] Need help with Bostomatic BD18-2 to linuxcnc
On 07/20/2020 09:00 PM, Tom Smart wrote:
> I forgot to ask how would I calculate the loss of abilities of the mill if i
> don't drive the servos with their maximum rated power and amps? If I were
On Tue, 21 Jul 2020 at 05:52, Tom Smart wrote:
> If i keep the amps at the rating of 9.1 I should keep my 31.3 IN-LBS or 2.6
> FT-LBS?
>
> So 2.6 / .0813 would be 81.76 lbs of linear force?
>
> So if my table weighs 200lbs my acceleration would be .41 G?
>
> I'm wondering if I've done a calculat
вт, 21 лип. 2020 о 06:17 Jon Elson пише:
> So, if your machine has a 200 Lb table, and the leadscrew
> were to produce 1000 Lbs linear force,
> it would accelerate at 5 G.
>
This is a simplified calculation, it doesn't account for rotary inertia of
ballscrew and other rotary parts.
You need to r
On 07/20/2020 11:49 PM, Tom Smart wrote:
So my 3500 rpm rated motor at 180vdc would be 2916 rpm at 150 vdc and 2333 rpm
at 120vdc?
Yes, exactly.
If my ballscrew is 5tpi then at rated voltage i would get 700 ipm at 150vdc 583
ipm and at 120vdc 466ipm feeds?
Yes.
If i keep the amps at the rat
On 07/21/2020 04:07 AM, andy pugh wrote:
On Tue, 21 Jul 2020 at 05:52, Tom Smart wrote:
If i keep the amps at the rating of 9.1 I should keep my 31.3 IN-LBS or 2.6
FT-LBS?
So 2.6 / .0813 would be 81.76 lbs of linear force?
So if my table weighs 200lbs my acceleration would be .41 G?
I'm wo
On 07/21/2020 08:33 AM, Andrew wrote:
вт, 21 лип. 2020 о 06:17 Jon Elson пише:
So, if your machine has a 200 Lb table, and the leadscrew
were to produce 1000 Lbs linear force,
it would accelerate at 5 G.
This is a simplified calculation, it doesn't account for rotary inertia of
ballscrew and
:31 AM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Need help with Bostomatic BD18-2 to linuxcnc
>
> On 07/20/2020 11:49 PM, Tom Smart wrote:
> > So my 3500 rpm rated motor at 180vdc would be 2916 rpm at 150 vdc and 2333
> > rpm at 120vdc?
> Yes, exac
On 07/21/2020 02:54 PM, John Dammeyer wrote:
Hi Jon,
How did you come up with the constant 0.0318?
Long story. There's complicated formula to compute it from
the helix angle of the screw.
Too much fiddling around. So, if you had a drum with a
string wrapped around it that advanced the
axis as
C)
> Subject: Re: [Emc-users] Need help with Bostomatic BD18-2 to linuxcnc
>
> On 07/21/2020 02:54 PM, John Dammeyer wrote:
> > Hi Jon,
> > How did you come up with the constant 0.0318?
> Long story. There's complicated formula to compute it from
> the helix angle of
On Tue, 21 Jul 2020 at 21:54, Jon Elson wrote:
> > How did you come up with the constant 0.0318?
> Long story. There's complicated formula to compute it from
> the helix angle of the screw.
Or a very simple formula based on a unit circle and the lead, simply
comparing two distances.
--
atp
"A
text output.
John Dammeyer
> -Original Message-
> From: Jon Elson [mailto:el...@pico-systems.com]
> Sent: July-21-20 1:52 PM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Need help with Bostomatic BD18-2 to linuxcnc
>
> On 07/21/2020 02:54 PM, Joh
On 07/21/2020 06:53 PM, John Dammeyer wrote:
Jon,
Here's a screen shot (assuming it makes it through). I used your 100 oz-in motor
and 0.2" pitch screw. I set the RPM to 3000 but with a 3:1 reduction. Not
sure If it would be better to just add two boxes for the reduction so that 0.25 is
rea
o:el...@pico-systems.com]
> Sent: July-21-20 6:19 PM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Need help with Bostomatic BD18-2 to linuxcnc
>
> On 07/21/2020 06:53 PM, John Dammeyer wrote:
> > Jon,
> > Here's a screen shot (assuming it makes it
e Controller (EMC)
Subject: Re: [Emc-users] Need help with Bostomatic BD18-2 to linuxcnc
On Mon, 20 Jul 2020 at 02:44, Tom Smart wrote:
> The motor is this glentek GM4040-41 180vdc, 9.1A. I decoded the serial number
> it has no brake, no tachometer, a special encoder, no resolver.
Just
On 7/21/20 10:09 PM, John Dammeyer wrote:
> If Gravity is 32 ft/sec^2 then it's also 2.7 in/sec^2.
Only if there are 12 feet in an inch, but there are 12 inches in a foot,
so one g is 384 in/sec^2.
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Crap. Went the wrong way...
> -Original Message-
> From: Bruce Layne [mailto:linux...@thinkingdevices.com]
> Sent: July-21-20 7:57 PM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Need help with Bostomatic BD18-2 to linuxcnc
>
>
>
>
-
> From: Bruce Layne [mailto:linux...@thinkingdevices.com]
> Sent: July-21-20 7:57 PM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Need help with Bostomatic BD18-2 to linuxcnc
>
>
>
> On 7/21/20 10:09 PM, John Dammeyer wrote:
> > If Gravity is 32
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