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Linley Jig Borer restoration

cecilstrange

Aluminum
Joined
Nov 16, 2007
Location
Portland OR
I have been putting about ten hours per week, on a hobby basis, into this project for a couple of months. As a mill, it was in good condition when I traded for it. As a jig borer it needs a complete realignment. It is an older model without power feed and with LB collets.

Forrest Addy and Don Roberts have been very generous with expert advice as I build my machine alignment skills. But neither of them is a source of specific information about the Linley machine. So I am going to post questions here as I need help.

I have no parts diagram for the machine. A copy would be much appreciated. I do have a sales brochure for the later model if anyone wants it, but it is widely available.

I am reworking the guides for the sliding workhead. They are two lenghts of ground 3/4" X 3/4" steel that bolt between the slides of the workhead and pilot it in the groove between the vertical, flat column ways. The left side of the groove is scrape finished and obviously guides the workhead. The right side still shows fine scratches from a grinding wheel or milling cutter but there is a slightly polished area, from top to bottom, in the middle of the right side of the groove, where something has been rubbing. The right side edges of the steel guides have two holes bored, about 7/16" diameter and 5/8" deep. These bores were empty when I got the machine but my theory is that they are meant to carry spring loaded pistons, maybe of brass, that force the workhead against the guiding side of the groove.

I would like to confirm this theory with someone knowledgeable about these parts. Short of that, I invite comments on whether, and how, to act on my theory. Spring force and piston material are two decisions I will have to make in order to act.
 
Here is the only picture I took before dissassembly. The table is already off.
http://www.practicalmachinist.com/vb/attachment.php?attachmentid=13783&stc=1&d=1246899218

Separate shots of the table show how it had sagged .002" at each end.
http://www.practicalmachinist.com/vb/attachment.php?attachmentid=13784&stc=1&d=1246899218

http://www.practicalmachinist.com/vb/attachment.php?attachmentid=13785&stc=1&d=1246899218

The quill. spindle, screws and nuts seem to be in excellent condition. None of the alignments were precise, but the slides and ways are not badly worn. The paint is new and horrible. The hand wheels are the most beautiful I have ever seen.
 

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