MACHINE SHOP TIPS #15 Bridgeport Mill TRAMMING with SPINDLE SQUARE tubalcain

Tubalcain shows how to indicate or tram the bridgeport mill head into perfect squareness with the table. He uses a new instrument called a SPINDLE SQUARE .

Category:

Science & Technology

Tags:

• bridgeport
• mill
• south
• bend
• lathe
• atlas
• clausing
• delta
• logan
• hardinge
• rockwell
• starrett
• steam
• engine
• stirling
• john
• deere
• ridgid
• toledo
• ream
• tapered
• threads

[timothysvec]

When you do fly cutting, do you bring the head a little out of alignment, so the tool does not drag on the back side?

[mrpete222]

@timothysvec  Yes.

[SlowEarl1]

New video quality is excellent.Thank you for taking the time to make videos.

[mrpete222]

@SlowEarl1 Sony hdr-cx110. It takes much much longer to edit & upload the HD files.

[junkradioblahblah]

you should check the tram @ 0 then 180 degrees just the same way as you use a .0005 level to see if it's in calibration because the shaft may not be at 90 to the base

[JDSly1]

Very nice little device there. I have always used the "sweeping" method, which is tricky and time consuming. How much does one of those typically cost? Very informative video. Thanks.

[conatuslife]

@mrpete222 wouldn't having the head out of alignment for fly cutting cause a concave surface?

[mgreenl24550]

So, if you don't have this fancy device, what is the best way to do this? I'm guessing I would use a magbase in the spindle and rotate is 180 degrees out a couple of times for each direction. Suggestions?

[BerkeleyGang]

If the table isn't perpendicular to the knee dovetail, there will be a perpendicularity error between the knee's dovetail and the spindle. This will result in unwanted movement of the cutting tool when using the knee to raise the part into the cutting tool, instead of using the quill.

Although I'm not using a Bridgeport, I'm curious if table perpendicularity can be adjusted, and how it's checked.

Great series - keep up the good work. I've learned SO much.

[bronk5150]

Thanks again! As always, informative and complete!

[moparmuppet]

Another great video - thanks so much Mr Pete.

[joleenmorganjohn]

@antifactionprogman I think happymark is on to something. Ive have writen my thoughts to him. If you feel incline, please check back to the comments and see if you agree with my explination.

[joleenmorganjohn]

@happymark1805 Calibrate the unit in the spindle itself. Put a parallel on the table and zero one indicator over it. Then spin the spindle and unit to the other indicator and zero that one over the same spot as the first without moving anything else. Then the indicators will be calibrated to the same point. Another way is... After your adjustments have been made to the machine head and you think its trammed just pick one indicator and see if it reads zero spinning it to left and right.

[joleenmorganjohn]

@happymark1805 Your not missing much. Radial runout wont effect much but a lateral runout will give you a false reading. In other words if the collet or a drill chuck does not hold the shank PERFECTLY perpendicular and square to the spindle axis of rotation, one indicator will be hire than the other. Giveing a false reading. But there is 2 easy ways to remedy that. Calibrate the unit in the spindle itself. Basicly .....Opp, I ran out of space to type.....