One of our users directed us to this thread. There seems to be some confusion with Leigh’s adjustable Guidebushings and we thought we should clarify to avoid further confusion. We in fact have two types of adjustable Guidebushings:
The common problem with routed box joints is that they rely on the correct size bit and guidebush. Due to common manufacturing tolerances, a couple of thousandths the wrong way and you either have a joint that’s too tight, or too loose. To solve this issue, Leigh created the patented VGS (Variable Guidebush System). This is a tapered guidebush that threads up and down inside a holder. Rotating the barrel of the VGS, up or down, increases or decreases it’s active diameter. A 1/8 turn of the barrel adjusts joint fit by a mere 0.001”! More information is available on our website. Due to the number of parts and machining required, this is a somewhat expensive system to produce.
To help lower costs and create a simpler method of joint tightness adjustment, Leigh introduced the Patented eBush (Elliptical Guidebushing System). Rotating the barrel of the eBush (left or right between increments 0 and 10, over a 90 degree range) increases or decreases its active diameter. Each increment on the face of the guidebush equals a 0.002" adjustment to joint fit. Using a setting between the marks adjusts joint fit by a mere 0.001”!
The VGS is now used only on the Leigh Isoloc templates. The eBushing’s are used on all of Leigh’s Dovetail Jigs and Finger/Box joint Templates.
Hopefully this helps clarify Leigh’s Adjustable Guidebush systems.
If you have any further questions or comments, please do not hesitate in contacting us.
Leigh Industries Tech Support Team
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