Average Reviews:
(More customer reviews)I give this pantograph one star because if a drawing is carefully traced multiple times the pantograph will produce copies that differ by much more than the width of a pencil line. The reason is that the diameters of the bolts that hold the arms together are less than the diameters of the holes through which they pass. These loose fitting bolts allow the arms to jiggle around as a drawing is being traced. Tightening the bolts doesn't help because the movement of the arms works to loosens the bolts.
Here is how I improved this pantograph: I went to a local Sears hardware store and bought a tap and drill combo set for 12-24NC bolts. It cost about $5. The drill size is larger than either of the two hole sizes used in the pantograph arms. The larger size was needed to allow a close fit between the bolt and pantograph arm. With the pantograph set to produce copies enlarged by the factor I wanted, I removed the bolts one at a time, drilled out the hole, tapped it, and threaded in a 12-24NC bolt. This was done for each bolt except the one that held the pencil lead. After filing a point on the bolt used as pointer, this pantograph now produces enlargements much more accurately than the original one.
Shame on the manufacturer for producing such an inferior product. Especially since it would have been so easy to make one that worked well. I doubt anyone in the company ever tested this product.
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