Comments (6)
from mechanics.
'''
mount the frame directly to the wall with hinges at the top.
'''
One of the beta testers, @gero, built his fram this way, using a scissors jack to adjust the angle of the frame. It worked well for him.
'''
The precision of the cnc machines can be influenced by ... the flatness of the bed,
'''
I found this to be the case, the plywood I used for a workarea bowed and caused changes in the angle of the chain from the plabne of the sprocket. This would cause the chain to jump. It seemed to cause the sled to have additional frioction toward the sides of the workarea as well, but I don't have any data to prove it.
from mechanics.
from mechanics.
'''
in your case this was inches worth of bowing
'''
That's right. The composite frame that @CMHinckley suggests would be one way to prevent that kind of warping.
from mechanics.
The max deflections of the top beam based on a total sled weight of approximately 17.5 lb (router, bricks, sled...) for the default frame is approximately 0.028" using Douglas Fir (Modulus of Elasticity of 1.8 million psi, and 2 x 4 framing). This includes the deflections resulting from the moment applied to the upright vertical members. This is a non-trivial portion of the target precision. The best way to reduce the deflections is to increase the stiffness of the members and the bed.
from mechanics.
That's true. Too, Doug fir is relatively strong but most users are using 'white-wood hem-fir' two-by lumber, which is less stiff and less stable.
from mechanics.
Related Issues (20)
- Motor runs every time in same direction HOT 31
- Bent Bolt HOT 3
- Initial plunge off path HOT 3
- Chain pull on setup. HOT 5
- Chain link height HOT 3
- Detailed specs for motors and encoders HOT 3
- All_Parts_Laid_Out.svg AngleBrace1 error HOT 10
- All parts SVG missing parts HOT 5
- Source for Motor mounts HOT 1
- Avoiding tearing down the temporary frame HOT 2
- Correct github/linguist issue
- Why does the shop have a picture of z-axis mounted sideways on a motor mounting plate? HOT 1
- Frame flex HOT 16
- Wiki page claims 0.25in router bit but links to 0.1875in router bit. HOT 7
- SketchUp Motor bracket files not opening in SketchUp HOT 1
- Broken link in wiki ("Z-Axis" page) HOT 2
- Additions to Z-axis Kits
- Broken link or missing info HOT 6
- Different hardware than assembly guide/ videos HOT 6
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