Upgrade shock absorbers for shipping Tracker

[rocco8773]

The previous shock-absorbers (62225k6) used for shipping the Tracker to SSL have a 300 lb capacity. Four of these absorbers were used at the time since the Tracker assembly weighted about 1040 lbs. Once at SSL the Tracker was built up an additional 190+ lbs was added; thus the previous absorbers are no long sufficient.

Action Items

• [ ] See if Jerry has a model of the previous shipping structure.
• [ ] Review for best solution

Possible Solutions

1. Add addition absorbers of the same model to be load capacity.
2. Upgrade absorbers to a higher capacity model, maybe 62225K8 with a 500 lb capacity.

Either solution will require modification of existing shipping structure.

[rocco8773]

I made a Google sheet to calculate how suitable an isolator is for out application. There spreadsheet can be found here.

The spreadsheets calculations are taken from Enidine's datasheet.

[rocco8773]

The isolators purchased for shipping from Bates to SSL are John Evans' Sons, Inc. HM08375-1B, which are very similar to Enidine's WR12-200-1B. However, when comparing the compression-load charts the John Evans model is a little stiffer.

John Evans HM08375 (curve 1)

Enidine's WR12-200 (curve 1) WR12-300 (curve 2)

[rocco8773]

It's been determined the original idolators are sufficient, but it's still desirable to select different idolators to add more shock resistance down the road. This will be done after the NTS TVAC tests.

While the idolators are rated for a 300 lb static load, they can handle much higher loads (up-to 1000 lbs). Thus, the four idolators can support the entire upper frame while packing.