february 25 th 2008. overall views and concepts ◦ adam stagnaro (machining) ◦ stephen steger...
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February 25th 2008
Overall views and concepts
◦Adam Stagnaro (Machining)◦Stephen Steger (FEA)◦Karina Pikhart (Solidworks)◦Sarah Cooper-Davis (MathCAD )◦Tess Veuthey
WBS Tasks Task LeadStart End Dur
atio
n (D
ays)
% C
ompl
ete
Day
s C
ompl
ete
Day
s R
emai
ning
1 Fabrication John 2/11/08 4/11/08 60 20% 12 48
1.1 Spindle shaft 2/11/08 2/25/08 14 100% 14 0
1.2 housing 2/25/08 3/07/08 11 0% 0 11
1.3 housing end caps 2/25/08 3/07/08 11 0% 0 11
1.4 cross-feed flexure 3/17/08 4/01/08 15 0% 0 15
1.5 lead screw flexure 3/17/08 4/11/08 25 0% 0 25
2 Error model task Jane 2/11/08 5/14/08 93 0% 0 93
2.1 list of spindle error sources 2/11/08 2/25/08 14 0% 0 14
2.2 model individual spindle errors 2/11/08 3/10/08 28 0% 0 28
2.3 finish full spindle error sources 2/11/08 5/14/08 93 0% 0 93
2.4 list of flexure error sources 3/03/08 3/17/08 14 0% 0 14
2.1 model individual flexure errors 3/03/08 3/17/08 14 0% 0 14
2.2 finish full flexure error model 3/10/08 4/07/08 28 0% 0 28
2.3 list of drive error sources 3/31/08 4/07/08 7 0% 0 7
2.4 model individual drive error 3/31/08 4/28/08 28 0% 0 28
2.5 finish full drive error model 3/31/08 4/28/08 28 0% 0 28
2.6 HTM-based lathe error model 2/11/08 5/14/08 93 0% 0 93
3 Measurement task dates Bill 3/07/08 4/28/08 52 0% 0 52
3.1 CMM training 3/07/08 3/21/08 14 0% 0 14
3.2 Spindle error motions 3/07/08 3/17/08 10 0% 0 10
3.3 Cross Slide error motions 3/19/08 4/07/08 19 0% 0 19
3.4 Carriage error motions 4/07/08 4/28/08 21 0% 0 21
4 Report results and Conclusions Bill 2/11/08 4/28/08 93 0% 0 93
4.1
Outline (text, table & figure placeholders) 3/31/08 4/07/08 7 0% 0 7
4.2 images 2/11/08 4/30/08 79 0% 0 79
4.3 tables 3/10/08 4/30/08 51 0% 0 51
4.4 1st draft in separate modules 4/07/08 4/30/08 23 0% 0 23
4.5 integrated, final draft 2/28/08 5/14/08 76 0% 0 76
4.6 design notebooks 2/11/08 5/14/08 93 0% 0 93
5 / 5
/ 08
5 / 1
2 / 0
85
/ 19
/ 08
4 / 2
1 / 0
84
/ 28
/ 08
3 / 1
0 / 0
83
/ 17
/ 08
3 / 2
4 / 0
83
/ 31
/ 08
2 / 1
1 / 0
82
/ 18
/ 08
2 / 2
5 / 0
83
/ 3 /
08
4 / 7
/ 08
4 / 1
4 / 0
8
n=σyield / σ max
Chosen Safety Factor: n=3
Worst Case Scenario Tool Hits Chuck
NEF
sT
MkgEI
Idot
T
T
TFWP
MN
srad
WP
P
tool
impact
tool
tool
41.1
033.0
36.1
/
/
)(0
375
21.4
/89
375
*
2
@
Production and Calculations
Fcutting
RA RB
RA = -0.5 Fcutting
RB = 1.5 Fcutting Fcutting
-0.5 Fcutting
-1.5 Fcutting
Determined that bending stress is greatest at D (σd = 10.5 kpsi)
For 12L14 steel:
◦ Sy = 60 kpsi
◦ Se = 31.1 kpsi (calculated)
With given load, the part has infinite life (σd< Se) and does not yield (σd < Sy)
Safety Factor 2.96 for endurance limit Safety Factor 5.7 for yield
Using σm = σa = 10.5 kpsi, plotted data on Goodman diagram. Well within acceptable range Calculated cycles to failure: N = 1.81*1010 cycles
Manufacturing Thermal Material Bearing Deflection Vibrations
Shaft fabrication
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