[ Log In ]
[ Register ]

Question #: 12197

Question: Need to stop abrupt accelerations, on direction changes. Puts everything out of alignment. 4x8 Blackfoot

Current Solution

The acceleration setting in Mach3 or other control software you may be using should be relatively low. For the blackFoot, we don't exceed a value of 20 for acceleration. To modify the acceleration in Mach3, go to the motor tuning option under the config menu.

Make sure to use exact stop rather than constant velovity if the velocity is set high so the corners will not curve. Having a high velocity and low acceleration, constant velocity will cause the corners to become rounded. With exact stop, the outside corners will be as intended and inside corners will be the diameter of the end mill.

Additional Information:
I was unable to add that I am using PlanetCNC. My understanding is the USB breakout board is only planetcnc compatible.
I have changed accelerations to a minimum (was only ever 10, now at 1) and it still "jumps" fairly randomly.
I have lowered speeds to absurdly low. To slow without burning out bits if I was actually cutting. Still Y axis particularly jumps from speed of 300 to 2000 or more.
I am using mm. I set the bit feedrate to 30mm/sec.
The sudden jumps only ever seem to happen at the start of a cutting program. 5-10min in and it settles. With little or now sudden accelerations.
I am not using constant velocity.
Any guidance appreciated.


Other Possible Solutions to this Question

Get Help with:
This Product
Tech Support
This Product
Order Query
Tech Support
Not logged in. Log In Register
Track Order(s)
View Order(s)
I Want to Schecule a One-On-One Paid Tech Support Session
Book an Appointment Pertaining to a BuildYourCNC Product (Free)
Ask a Quesion Below (Free):
Book an Appointment Pertaining Other Equipment ($60/half hour)
Book an Immedite Appointment Pertaining Other Equipment ($120/half hour)
Ask a Quesion Below (Free):
Waiting for response... I may not answer immediately, but I was notified on my cellular phone so my response is forthcoming. If I don't respond immediately, you can always go to the [My Account] page to see all of our chats at any time.