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7x10, 7x12, 7x14 Mini-Lathe Information
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BACKLASH AND LEAD ACCURACY
What is backlash
and why does it matter? What about lead accuracy? How does it affect me
and my machine? Or in other words... "In search of 'perfection'"
Also: Ballscrew and ACME Leadscrew Accuracy
- BACKLASH IN A MANUAL WORLD
- CNC TO
- OTHER DESIGN CONSIDERATIONS AND THE
PROS AND CONS
BACKLASH IN A MANUAL WORLD
Not quite. You've just experienced backlash!
This is the axial play/lash/slop between the threads of the nut and the
threads of the screw. Many machines have this and perhaps this is more
noticeable on machines without any sort of mechanism to adjust for
backlash. More on that later.
While backlash can be frustrating especially
when you do not have some form of table positioning system in place such
as a digital readout (DRO) that employs the use of axial measuring devices
(like the digital calipers you use to measure your workpieces), it does
not critically affect the outcome of your workpiece as long as you, the
operator (aka "human CNC machine"), keep track of your table positioning.
Imagine life without a DRO - you would have
to know what your machine's backlash is (and this backlash increases with
time unless you keep your machine adjusted properly) and "do the math"
during respective axial changes. (Ever wonder why those dials on your
handwheel move around? This is one reason!).
With DRO, you are literally the motor
cranking the handwheels to move the table and workpiece per your
dimensions. Much easier!
Looking for mini-mill help and how-tos? How about lathe help and how-tos?We're prototyping a benchtop CNC vertical mill using the DigiSpeed-XL interface card for Mach, Dart Controls and KB Electronics KBIC/KBMM 90VDC motor controllers, 1.5HP treadmill motor from Surplus Center and a R8-spindle head from the X2 mini-mill - not to mention Gecko servo drives and an entirely closed-loop system. Come take a look!
CNC 8x12 Lathe
Check out our newest developments like the CNC/DRO 8x12/8x14 lathe using Gecko drives, break-out board, NEMA 34 step motors, DRO and more!
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