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Jig Borer

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Darren:
Could someone please tell me the difference between a jig borer and a milling machine, cos I've been wondering for quite a while....and it's making me restless.... :)

John Stevenson:
Well have sit down, a scratch and a glass of milk and behave yourself..............

John s.

Darren:
Ok..... :coffee:

John Stevenson:
Jig borer.

Same layout and build up as a mill but differ in subtle ways. Made for very, very accurate location and boring of holes.
Spindle usually quite light, bearings more suited to axial load than radial as all the thrust from boring is down.

leadscrew very accurate and often had some form of compensation to take out errors in the screw.
Usual one was a strip of hand scraped steel running at the side of the screw that carried a follower, this in turn would move the zero mark for the dial in places where the error of the screw needed to be compensated.

Many had early forms of optical measuring or at the least a dial gauge and a set of measuring sticks so a direct reading could be taken. A decent jig borer like a BCA will make a good mill for small model making but some of the purists and flat earth society will throw their arms up in the air.

A thing of the part nowadays given the accuracy of modern CNC's.
.

John S.

Darren:
Ta....that certainly clears that one up..... :thumbup:

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