Bridgeport tram tools

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Philbur addresses the purest camp clearly with this remark:. I think that shimming the bed must be the last resort, not the first, for correcting a tram error.

Tramming the table tells you that the spindle is not perpendicular to the table surface assuming the surface is flat! The column may not be square to the table, or the spindle may not be square to the column, or both.

Twisting the bed will most probably mask one error by introducing a second error. The correct method is to identify each error individually and correct it without influencing any other alignments. The natural assumption is that the stand should be flat and rigid, then you put the machine on it and everything is perfect. The reality of the world is that everything is flexible, even those things that appear rigid.

The stand is less rigid than the base of the mill itself and when the lb mill is placed on the stand, the stand moves a few thousandths of an inch in reaction to the weight of the mill. Machine geometry can seem straightforward, but it becomes complex when you start to understand the fine details.

The iron base of the mill goes through both a heat soak stress relief and a vibration stress relief process so residual stresses are unlikely. The stand is a welded fabrication and will always have some residual internal stresses.

If some alignment issues show up over time it could be the result of a crash, motion in the iron, or motion in the steel stand. We believe the stand is the most likely source.

In the actual manufacturing process each machine base is checked on a large surface plate before the machine is assembled. Assembly and test is not done on a surface plate, but the rather on a three point stance. Works fine for a lot of jobs and makes it real easy to tram in that last little bit with a dial indicator if I want it "perfect". This video shows a pretty painless way of tramming a vise if you're using a dial test indicator and starting from scratch Originally Posted by LKeithR.

Tom's two cents on vise tramming - YouTube. DrHook , M. Naegle liked this post. I use the old back it up till the screws stop in the slot then move it back some more I was so excited lol. Originally Posted by plastikdreams. TeachMePlease , neilho , Screwmachine liked this post. I've known old planer hands occasionally square up the workpiece on the table by carefully jogging the table with the workpiece sat loosely on it into the cross rail of the planer!

If I saw them doing it there'd be a row but they still did it! Regards Tyrone. Its amazing how close just a trained eye can get you.

On a vmc; I'm pissed at myself if I put a vise on it and I can't eyeball it closer than. I know the flanges for the hold down bolts get in the way but if you have a vise that does not have them, a square gets you close too. I always lightly snug one mounting bolt, touch the fixed jaw with a spindle mounted indicator, move the table to the other side of the fixed jaw and tap on the vise until the indicator matches the first side, run the table back to the starting point and double check?

Usually can get it perfect in two tries. Tramming the head on a milling machine is just one of the many measures taken to ensure accuracy and precision in the machine shop. It is a unique procedure.

To put it simply, tramming the head of your milling machine means making sure the head is square to the table, or the vice. There are different ways to tram the head of your mill. These are three different reliable and common ways to get the job done along with some little tips and best practice to ensure accuracy.

You can also check our video with Matt Schmelzer from Northeast Wisconsin Technical College In this video Matt will bring forward his expert opinion and walk you through using the tools, that are listed below, to get the job done.