Thread: What is a Jig Borer used for ? Ooooh! Jig Borers, I am all excited! They got their name form the fact that they were used to put the holes in dill jigs. That is more difficult than most people imagine. They have to be super accuately spaced because the interchangeability of parts depends on the accuracy of the tools, fixtures and jigs used in their manufacture.

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Tha analogy here is the care with which a printing plate is made. Any errors will be repeated thousands of times in the product.

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In Europe these things are also known as Co Ordiante Hole Borers. Yes, Europeans use jigs, but before the wars, they were not as production oriented as the USA. This probably explains why the Swiss jig borers had milling capabliity before the American machines had it.

It was common practice to finish machine parts on the Borers. I have catalogs that show the headstock bearing and shaft holes in the American Pacemaker Lathe being bored on an American Hole Wizard Radial Drill Press using a massive tumble jig. Other catalogs I have show German headstocs being bored and milled on heavy duty jig borers in a much simpler set up. This is just one example of the differing approaches used by American and European machinery builders. American and European designs of jig borers. There are three dominant design layouts of jig borers and three dominant setting systems. The American pattern of jig borer resembles a drill press with a co ordinate table.

A vertical column at he back of the machine carries a spindle head on sliding ways perfectly perpendicular to the table axes. The driving machinery is at the top of the column. The Pratt & Whitney was the first commercially successful American jig borer, Others ae the Fosdick and the Moore and the little Linley.

The Planer type machine is typified by the SIP machines. They really DO look like planers.

Their table traverses on a heavy bed and the spindle head is carried on a cross rail supported by double columns. The driving machinery of the older ones was located on the base of the far side column and power was transmitted by shafting and right angle gearboxes to the spindle head. In the late 1. 95. SIP and Hauser designed spindle heads with the motor mounted within them. In 1. 93. 4, SIp introduced their "Hydroptic" machine.

It was revolutionary. The table had a hydraulic cylinder table feeding arragement and co ordinate settings were made by reading precision standard scales through optical maginfication. The machine was heavily built and could do some respectable milling.

This enabled European machinery manufacturers to use the jig borers directly in the manufacturing process. Justin And The Knights Of Valour Cartoon Full Hd. The geometric accuracy of workpieces finished on the Hydroptic machines significantly reduced the amount of hand finishing required in the assembly of precision made machines. All drilling and boring jigs were eliminated and fixtures finished on the jig borers enabled rough and simi finish milling to be done more accurately. Finished pieces coming off the jig borer were for all intents and purposes ready for assembly.

The Hauser Works in Bienne, Switzerland made planer type jig borers very similar to the SIP. They had settings by leadsvrews.

Mitsui Seiki in Japan made a dead nuts Knockoff of the SIP. They used optical settings on standard scales even on their No 3 and No 4 and No 5 machines where as SIP made the MP 3. K and the MP 4. G and the MP 5. E with screw settings. Mitsui Seiki's are NICE!

It is ironic that the Ameicans were slow to adopt the practice. Even more Ironic is the fact that when I toured Pratt & Whitney in the late 1.

While the Swiss and Germans were merely "spotting up" bearing surfaces, Pratt & Whitney was handscraping the hell out out of them and testing with straight edges and big old test arbors. As an aside here, you will notice that the long ways on the Deckel Milling machine are fine milled, you can see te cutter marks, they are not even "flaked".

The mating surfaces are "spotted in". Gear. Heads worship the Deckel, but if Bridgeport tried that their factory would be beset by mobs of irate machinists carrying torches, tar and feathers.

The third arrangement of jig borers is the Horizontal Spindle type. In 1. 94. 8, Dixi of Switzerland introduced the Dixi 6. It looked just like a horizontal boring mill except the spindle head was guided on twin upright columns. Feed motion was Hydraulic and settings wee optical. An in built rotary table with optical settings was standard. When that thing hit the market I am sure there were some worried looks and fast heart rates in Geneva. That is, if Swiss Hearts can actually be made to beat fast with excitement - I have never seen an excited Swiss)Dixi is still very much active in the CNC industry.

Their series 7. 5 manually controlled machines are something right out of science fiction. Scotty's boring mill.

How else could he keep that piece of junk, The Enterprise, going after His Captain kept wrecking it? The best known horizontal jig borer in the USA is of course De. Vlig's "Jigmil" EVERY machine tool plant I have ever toured has at least one. There are even "Jigmil Shops" who specialze in doing contract boring work. The setting system uses micrometers and end standards with an automatic positioning system.

The feed motion is mechanical. The third axis is the machine's boring bar spindle. There is an optional turret type depth stop system for the bar. During the 1. 96.

Lucas, Giddings and Lewis and Cincinnati Gilbert made super accurate versions of their horizontal boring mills and sold them as horizontal jig borers. De. Vlieg used was the dominant one. I am not sure, but I believe the auto position works was made by an independent outfit since a lot of machines used it and there were no patent fights that I know of. De. Vlig did get mad at Lucas when Lucas introduced their model 3 SP and 4 SP Super Precision Horizontal Jig Borers. Lucas made only one of each and then backed off.

Personally I would have LOVED to get into That Fight. Lucas wasn't even close to a patent infringement and I think the Lucas was a better machine. The three dominant setting systems for jig borers are the end measure and micrometer system, the leadscrew system and the optically read standard scale system. The Pratt & Whitney and the Fosdick used the end measure system. It is the same system that can be installed on any machine. There are troughs laid along the X and Y axes. There is a fixed stop on one of the moving or stationary members and a dial indicator on the other.

Cylindrical end measuring rods of whole inch lengths are laid in the troughs along with a cylindrical setting micrometer gradated in "tenths". The moving member is then carefully moved so as to contact the rods and micrometer and bring them up to the indicator so that the idicator, also graduated in "tenths" reads zero. This is done for the initial setting. All subsequent settings involve either adding or subtracting end standards and rsetting the micrometers for fractional inch settings. The machine is "In Position" when the dial ndicator reads zero. The dial indicators are good, you can see a half a tenth and estimate a quarter. The end standards are good when they are new, but they can be subject to wear and they carry their additive errors when laid end to end.

They are not good in a dirty environment and they shouldn't be handled too much when doing fine work (body heat)The micrometers are questionable. They are subject to error just like a shop mike and they are a devil to calibrate to "tenth" accuracy.

The leadscrew setting system is the most popular on jig borers. SIP, Hauser and Moore and many others use it. It is accurate and fast and trouble free. Moore made only small jig borers and they were obsessive about the lead accuracy of their measuring screws. The screws had a special modifcation of the Acme Thread form and Moore was able to fine finish the screws to fantastic accuracy over ther entire length.