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| Anzaniste:
I was squaring up a block in my Centec Mill following the standard procedure described in several places using a piece of bar on the moving jaw to stop lifting. The work piece came out tapered. ( I had checked the tram and it was fine). The way it was tapered suggested the vice jaw was not truly perpendicular Mystified I eventually ran a dti up and down the face of the fixed jaw on the vice and it was not vertical by a couple of thou! A square against this face with a light behind gave no indication that the jaw was not square to the vice. :scratch: Puzzled I wondered what to try next. I bolted a 1-2-3 block to the bed as below................ DSCN0321 by Anzaniste, on Flickr And ran the knee up and down. From top to bottom of the block it was out by 5 thou, the bottom of the block being furthest away from the column. Suspecting the block I tried it all different ways end for ending etc. and got the same result. :palm: If I grab hold of the knee and lift it the dti deflects about 5 thou however I cant imagine how this can be the same as running the knee up and down on the dovetail slide. :( Can any one offer any advice, explanation or remedy? |
| Jonny:
Play or wear in the vertical dovetails or not locked down. Does the knee get tight at either end or sloppy in the middle? |
| krv3000:
HI just my thought on this if you can move the knee up and dawn as you describe have you tried to a gust the Gib to see if that improves it |
| Fergus OMore:
Go into 'Advance Machine Work' by Robert H. Smith. It's a freebee on the net Basically it is pages 14 -14 to 16 but there is a lot more general alignment information surrounding this. Cheers N |
| Anzaniste:
Thanks for your comments. Got distracted by London Model Engineering Exhibition this weekend so have not been in the shed. I had considered the possibility of gib tightening and that will be my first move. FOM. Thanks for pointing me to the book, I've actually got a copy on mt book shelves and hah forgotten how much of that kind of info was in it. I'll have to stop my self from being distracted by my new toy, a Leinen Jig Borer, and sort out the Centec. |
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