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Fray Car Build
Click on the section of the topic you are interested in. This is a work in progress, anyone who wishes to contribute PLEASE do send me an email.
Preamble
I. Selecting a Chassis
II. Straightening a Chassis
III. Selecting a Gear Plate
IV. Selecting Magnets
V. Selecting a Crown Gear
VI. Selecting a Rear Axle
VII. Selecting Rear Rims
VIII. Selecting Rear Tires
IX. Selecting Front Axle and Tires
X. Selecting an Armature
XI. Selecting Pinion Gear and Shaft
XII. Selecting Top Gears
XIII. Selecting Motor Brushes
XIV. Selecting Pickup Shoe Springs
XV. Selecting Pickup Shoes
XVI. Selecting a Fray Body
XVII. Selecting a Guide Pin
XVIII. Bench Testing the Build
V. Selecting a Crown Gear
SECTION
IMAGE
Crown Gear Options?
Vendor ItemCat ItemManu Product
Code 		ItemDesc Part Image Item
Price 		Qty Fray
Appr 		Outof
Stock

https://www.wizzardho.com/ 		Fray_Crown_Gear Wizzard RGT15x T-Jet Crown Gear $4.00 Yes

http://rt-ho.com/index.html 		Fray_Crown_Gear RT-HO RT-170 CNC MACHINED CROWN GEAR for 9 Tooth Pinion Gear

DELRIN® AF BLEND, PTFE-FILLED BROWN COLOR from Solid Stock 		$6.50

http://rt-ho.com/index.html 		Fray_Crown_Gear RT-HO RT-172 CNC MACHINED CROWN GEAR for 12 Tooth Pinion Gear

DELRIN® AF BLEND, PTFE-FILLED BROWN COLOR from Solid Stock 		$6.50
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2020 Fray in Ferndale Rules:
ADDITIONAL APPROVED PARTS FOR 2023 [4]
-- Wizzard E81, E81A, E81B, E85, E90
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More 2020 Fray in Ferndale Rules:
INDIVIDUAL RACING [4]
-13. Only stock TJet or commercially available stock replacement 15 tooth crown gears are allowed. The crown gear diameter must equal or exceed .300″. In reducing the crown gears to .300″, the crown gear must maintain the 90 degree angle to the back of the gear’s top and bottom. The gear cannot be angled, tapered, rounded, beveled, thinned, sliced, diced, drilled, etc. The idea is to allow the stock crown gears to be the same diameter as the aftermarket crown gears. This will be looked at VERY closely. The crown gear boss may be trimmed, spacer(s) may be added to adjust for proper gear mesh within the crown gear box. You can add a small delrin retainer to the driver’s side rear axle for the purpose of adjusting crown gear mesh with the 9T rear pinion. The diameter of the delrin retainer must not exceed 0.125″ with a thickness not to exceed 0.070″.
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Installing a Crown Gear

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