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Jul 3, 2017 - $10. * Lower Cost for sealing part as well: Only HK$2.5 for one rubber ... make sure it can be fitted into the threaded portion of Female coupling.
RaDeCC Sample Holder / RAD7 Incubator DIY Research System – Multipurpose Sample Container (MSC) 多用途 樣品管 with observation windows option Edited by Alan Kwok July 3, 2017 Main Index DIY Research Fieldwork Equipment Operation Study 科學 研究 工藝 實紀 https://www.researchgate.net/publication/318051172

Introduction DIY the “RaDeCC Sample Holder” reduces our holder cost to affordable range. My new design may solve the rubber plug damage problem (increase the sealing contact circumference) as well as catered material / part local supply issue, Easy Make, Low Cost, Good Performance, etc.

High Cost product from manufacturer (http://www.radecc.com/):

After the prototype completed, I realize that the new design also good enough for some other applications (i.e. multipurpose = more flexible and economic). Let me take “RAD7 Incubator” as an example – just use two valves instead coupling bodies, DONE!

D

C

B

A

Project https://www.researchgate.net/project/Details-of-Multipurpose-SampleContainer-Chamber-MSC-for-RaDeCC-RAD7duoyongtu-yangpinguanyanfaxiangjie Part information - “SPEARS” USA 1¼” NSFpw PVCI SCH40 D2466 Rubber plug damage problem @ high cost product

A: 2SY1P3, B: 2DE2D2 436-012, C: Length 200 mm, D: CAP

DIY Holder (New design)

High Cost Product

HK$120 DIY Holder E The material cost for the above DIY holder: ~HK$120 Coupling Bodies / Valves $60 Rubber Washers $5 Nylon Disks $5 40 mm pipe, female coupling, male coupling $40

F

Misc. $10 * Lower Cost for sealing part as well: Only HK$2.5 for one rubber washer replacement.

G

(How much for original rubber plug replacement?)

As no local supply for the above parts A, C and D; I have to make a new design according locally sourced material.

M

Making Steps 1.

OD 46 mm Nylon Rod: Cut 6 mm, 2 pieces * Water-cooling may need when nylon sawing/grinding

2.

OD 46 mm X 6 mm Nylon Discs: Reduce OD with grinder to 45 mm and make sure it can be fitted into the threaded portion of Female coupling (F)

3.

OD 45 mm X 6 mm Nylon Discs: Drill (5/8”) and Tap thread at the middle for 3/8” Coupling Body (E) OR Drill (11.5 mm) and Tap thread at the middle for 1/4” Valve

4.

Coupling Bodies Installation (with Thread Seal Tape)

5.

Female couplings (F): Cut out unthreaded portion at 5 mm from mid-edge-line (for Coupling Body) OR Cut out unthreaded portion at mid-edge-line (for Valve)

6.

40 mm pipe (M): Cut 200 mm

7.

The above pipe and two male couplings (G) are glued together

8.

Fit “Female coupling” “Coupling body disc” “Rubber washer” “Male coupling” together.

Making Steps (MSC with observation windows) The material cost for this DIY holder: ~HK$140 1.

OD 46 mm Nylon Rod: Cut 6 mm, 2 pieces * Water-cooling may need when nylon sawing/grinding

2.

OD 46 mm X 6 mm Nylon Discs: Reduce OD with grinder to 45 mm and make sure it can be fitted into the threaded portion of Female coupling (F)

3.

OD 45 mm X 6 mm Nylon Discs: Drill (5/8”) and Tap thread at the middle for 3/8” Coupling Body (E) OR Drill (11.5 mm) and Tap thread at the middle for 1/4” Valve

4.

Coupling Bodies Installation (with Thread Seal Tape)

5.

Female couplings (F): Cut out unthreaded portion at 5 mm from mid-edge-line (for Coupling Body) OR Cut out unthreaded portion at mid-edge-line (for Valve)

6.

OD 50 mm transparent pipe: Cut 140 mm

7.

40 mm pipe (M): Cut 200 mm; Open 2 windows (80 mm long, 30 mm wide) Glue 3 PVC spacers (5 mm X 5 mm) evenly at one end (50 mm from edge); Glue another 3 spacers at the other end; File all spacers to be ~1.5 mm thick and can fit into transparent pipe

8.

Glue 1 PVC male coupling to the above pipe; Insert transparent pipe and Add sealant (~10 mm wide) around the edge of coupling; Add sealant at the other end of transparent pipe; Glue another PVC male coupling

9.

Fit “Female coupling” “Coupling body disc” “Rubber washer” “Male coupling” together.

Old RAD7 Incubator

RaDeCC Sample Holder MSC

RAD7 Incubator Operation 1.

Open both ends * Hold those mated female and male couplings only. i.e. Don’t hold the middle pipe when opening / closing; otherwise, damage the glued seal joints.

2.

Check all rubber washers and sealing edges of male couplings – any wear / damage / dirt may cause leaking

3.

Put sample inside, and close both ends

4.

Make sure they tight enough (no leakage) Other possible application If the above new design is proved good enough, then it can be the next generation of “RAD7 Incubator” https://www.researchgate.net/publication/283199529_DIY_research_s ystem_RAD7_Incubator

* “Interchangeable Nylon Discs design” is the simplest way: with Coupling Body for holder / with Valve for incubator

Another MY DIY RaDeCC item @ https://www.researchgate.net/publication/290441026

Part information (http://hkcn.rs-online.com/web/)

(http://www.spearsmfg.com/) Coupling (Body, Insert): COLDER PRODUCTS CO -MPLS.MN-USA (http://www.cpcworldwide.com/Product-List/Series/1?Category=44)