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A jig borer precisely locates and bores precision holes. So the facility to locate accurately is utmost...so the screws are very accurate,..as well as the rotary table, and geometry is very good.Moore Jig borers and grinders are straight, square and perpendicular in 20 millionths range....and the lead screws, which are custom lapped, have a pitch error that is 80 millionths low per inch....this is to allow for the screw growing with temperature once the machine has run for a while.The idea is you mount the work, dial in the position and go...and it's right on the "fly (*@(! " which makes making these parts more cost effective.I can only assume this is one in miniature...probably for the watchmaking industry.....I can see a watch plate on that table very easily...carefully laying out pivot holes.Dave
If I may ask for some help as I restore it please as I will strip it down etc.
Quote from: Ginger Nut on October 13, 2018, 05:16:09 AMIf I may ask for some help as I restore it please as I will strip it down etc.Ray, could I move this to a separate thread so that your restoration does not confuse members with Phil's original postings Or have you already done that.. by extending Bob's threadJo
Ok Ray leave it here but there are others that also own BCAs Jo
I am quite happy to answer any questions if I can, but dont forget that mine is not actually a BCA, its a pre war German Boley & Leinen but the BCA mk2 is almost an exact copy of it.I was a bit gutted a couple of weeks ago.There was a BCA mk3 jig borer advertised for sale by a member of our Bradford ME club but I missed it by a few hours after it had been snapped up by someone else.The reason it was snapped up so quickly was that it had a miniscule asking price of £150 ono complete with a set of collets and original boring head etc. Phil