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PDR Vacuum Spool Clearances Check. T. Brown September 1, 2003. VV spool assembly clearance space allocation goal. 1.00 VV insulation 0.25 minimum gap at final position (also makes up part of the space needed for final assembly in the area of the VV spool piece)

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pdr vacuum spool clearances check

PDR Vacuum Spool Clearances Check

T. Brown

September 1, 2003

vv spool assembly clearance space allocation goal
VV spool assembly clearance space allocation goal

1.00 VV insulation

0.25 minimum gap at final position (also makes up part of the space needed for final assembly in the area of the VV spool piece)

0.188 VV fabrication tolerance (3/16”)

0.06 MC fabrication tolerance (1/16”)

1.50”

0.25” Additional assembly tolerance for final assembly (this value is 0.75” for the assembly of the MC over the VV).

1.75” Target clearance set for the MC to VV spacing in spool region

slide3

Reverence VV-06 vessel spool had 1.50 clearance to MC during assembly. With weld prep added to basic VV-06 spool the clearance degraded to 1.32”

Ref VV-06 basic spool

1.319” clearance

Note: We accepted the 1.5” clearance because we were expecting a .25” build reduction in the Type C MC.

slide4

Ref VV-06 basic spool

Spool altered to eliminate crease

PDR baseline spool

New PDR spool shape exceeds original boundary in some areas

slide6

5.100

3/8

1/8 VPI layer

4.10

Clamp

Winding

4.671

2.336

2.836

0.375

0.375 (9.5 mm)

Vacuum Vessel

2.175 (55.2 mm)

PFC’s

Plasma

Component Build Dimension Comparison

PDR Build

Reference Build

VPI layer ?

2.961

1.50 (1.0 insulation + 0.25 gap + 0.188 VV tol + 0.06 MC tol)

0.388

1.0

0.787

The clamp is .125” thicker but a large corner radii HELPS the spool assembly

slide7

ProE clearance study results

(this took a 2 hr run!)

1.060” low side

The two servos driving the spool are not properly adjusted to arrive at a maximum clearance value (see next slide).

slide8

Servo’s can be adjusted to obtain an average minimum clearance of 1.56 inches between the MC and new PDR VV spool piece.

1.060” low side

1.564 average

2.068” high side

slide9

Is 1.56” clearance OK?

0.5 Jim C needs 0.5” assembly gap at spool for final assembly

0.00 change VV spool tolerance to +0 / -.060

0.06 MC fabrication tolerance

1.00 Insulation

1.56” This will work!

Per discussion with Brad, the VPI layer is under the clamps

2.961

1.75” Target clearance that initially was set for the MC to VV spacing in the spool region can be reduced if the spool tolerance is changed to +0 / -.06;

or we can increase the clearance by going back to a 3/8” thick clamp.

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