Mechanical design update
> For the Y axis I ran a 5/16 (8mm) bar across the back side and had one plate with a> bearing. Then by using a double shaft stepper I only had one stepper motor. This will> be a lot better especially when you start trying to keep the X and Y axis perpendicular.
I have started with 2x Y motors thinking 2x the power would be good. Will the steppersreally get out of sync and cause the machine to become a parallelogram?
Also I have found that the 20 tooth idler pulley are not very good. Specifically, the inner race diameter is so thin that if you tighten a socket head screw against idler it will bind up the idler, hence you have to leave the pulley floating on the screw. Additionally in order to get belt centered you will need spacers between plate and pulley, this places large moment on the screw and has caused my 3D printed plates to bow. I am considering making new plates from aluminum or machining a plate when the material is left for spacing. I am also considering changing idlers to use larger ones with real bearings.
--
You received this message because you are subscribed to a topic in the Google Groups "OpenPnP" group.
To unsubscribe from this topic, visit https://groups.google.com/d/topic/openpnp/HxfYP5Gs_-o/unsubscribe.
To unsubscribe from this group and all its topics, send an email to openpnp+unsubscribe@googlegroups.com.
To post to this group, send email to ope...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/openpnp/49f4059f-a541-4b96-a1b2-3652da45e6ec%40googlegroups.com.
Sure,Once i complete design i ll update
On Apr 10, 2017 4:07 PM, "Arie Lashansky" <ariela...@gmail.com> wrote:
Hi Robo--
Can you please send me or post the 3d model for the part.
Thanks Arie
On Sunday, 9 April 2017 07:33:26 UTC+3, Robo wrote:Just m working on it and want to add some more functionality to tight belt by screw. i ll update soon
On Sunday, April 9, 2017 at 9:44:11 AM UTC+5:30, Robo wrote:Mechanical design update
You received this message because you are subscribed to a topic in the Google Groups "OpenPnP" group.
To unsubscribe from this topic, visit https://groups.google.com/d/topic/openpnp/HxfYP5Gs_-o/unsubscribe.
To unsubscribe from this group and all its topics, send an email to openpnp+u...@googlegroups.com.
It depends on the mass of the belt, the mass of the thing attached to the belt, the diameter (and mass) of the pulleys, and how quickly you want to accelerate that mass.
It’s actually not too hard to work out for a belt driven system. See http://www.leadshine.com/Pdf/Calculation.pdf
PK
From: ope...@googlegroups.com [mailto:ope...@googlegroups.com] On Behalf Of Robo
Sent: Tuesday, 11 April 2017 1:27 AM
To: OpenPnP <ope...@googlegroups.com>
Subject: [OpenPnP] Re: Design update
so if i use single motor than how much Kg-cm torque need ?
On Sunday, April 9, 2017 at 9:44:11 AM UTC+5:30, Robo wrote:
Mechanical design update
--
You received this message because you are subscribed to the Google Groups "OpenPnP" group.
To unsubscribe from this group and stop receiving emails from it, send an email to openpnp+u...@googlegroups.com.
To post to this group, send email to ope...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/openpnp/2a091786-8394-4670-8b79-2a466e0c6ce9%40googlegroups.com.
--
You received this message because you are subscribed to the Google Groups "OpenPnP" group.
To unsubscribe from this group and stop receiving emails from it, send an email to openpnp+u...@googlegroups.com.
To post to this group, send email to ope...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/openpnp/b59913e2-b04e-4e3a-b70a-1eec6adf1036%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
Have you tested the stepper motors running on the ribbon cable? I tried that but I had trouble with missing steps and no torque. I ended up replacing the ribbon cable with flexible Cat5 from network patch cables which worked much better.
Paul.
From: ope...@googlegroups.com [mailto:ope...@googlegroups.com]
On Behalf Of Robo
Sent: Monday, 5 June 2017 1:40 AM
To: OpenPnP <ope...@googlegroups.com>
Subject: [OpenPnP] Re: Design update
Almost ready except
--
You received this message because you are subscribed to the Google Groups "OpenPnP" group.
To unsubscribe from this group and stop receiving emails from it, send an email to
openpnp+u...@googlegroups.com.
To post to this group, send email to ope...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/openpnp/0317d2dc-fb0d-40e6-aa25-cd77f9ef2f15%40googlegroups.com.
Let's see. If any issue,i ll change with Network cable.
Thanks