HFT/FT TARGET CHECKER

BRIAN SAMPSON

 I give credit to the creator brian sampson. I am only putting this up here for others to print.

 There is some parts that need purchasing which can be bought from local hardware stores and online.

The aim of this project is to provide a means of manufacturing a device that can be used safely to test the operation of knock over style Field Targets during a competition so that target disputes and stoppages can be kept to a minimum.

The device is designed to give an equivalent impact force to an airgun pellet hitting the paddle of a target at 5.5 ft/lbs energy (7 Joules). To mimic the effect of a target being shot at with a WFTF legal air rifle at 55 yards

Printing

There are 8 parts that need to be printed, the STL files can be found in the STL directory. All dimensions are in mm and the parts are oriented so that no support structures are required.

For best results the parts should be printed in PLA/PHA filament) The Left and Right hand Cylinder parts may be prone to some curling on the edges and as a result it is recommended that they are printed individually.

Suggested printer settings

Layer height : 0.12 mm

Nozzle size : 0.4 mm

Print speed : 50 mm/s

Fill Density : 25%

Non-Printed parts required :

4mm diameter mild steel bar (140mm long)

M3 Nyloc nuts X 8

M3 x 30mm Cap Head Bolts X 8

Small spring - 10mm x 5mm

Main spring

12.7mm OD

1.25mm Wire

Stainless steel

140mm long

Rated at around 4Nm per cm of compression