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Author Topic: Milling Machines  (Read 5121 times)

mw11x300

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Milling Machines
« on: April 17, 2008, 02:34:02 AM »
This is a question for those of you who use mill drills.  I am considering making the investment so that I can create more accurate ovals.  First off I have never used one and know very little about how they work.  How do you set pitches?  Secondly, how do the table movements work for ovaling and do the pitches stay the same even though the table is moving?  Lastly, is it more economical to simply purchase the lower end Innovative machine around $4000, or can I save some money by buying a Jet 18" machine and attaching one of the standard three point jigs to the table around $2500?  Which is the better route?  Please only genuine posters, I only need information not a headache.

 

bluerrpilot

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Re: Milling Machines
« Reply #1 on: April 17, 2008, 11:36:10 AM »
You set pitches by moving the tables right, left up and back. Ovals require moving both axis to maintain correct pitch. and the movement depends on the amount of oval. YOu should look at the mill drill ive posted if your going to do ovals. The thickness of the column helps as the bit doesnt flex and move as much. No sense in spending a ton of money for the inovative press thats the same as the one below. they all have the same accuracy and specs

Get this machine http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=33686

if you want a Jet you should check out this one http://www.southern-tool.com/store/milling_drilling_equipment.html

and check out this guys jig and bits
http://www.ballreviews.com/Forum/Replies.asp?TopicID=195398&ForumID=26&CategoryID=12
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mw11x300

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Re: Milling Machines
« Reply #2 on: April 17, 2008, 03:44:20 PM »
Thanks for the info.  Your post however leaves me with another question.  If the pitches and ovaling are all done by table movements, would I need a mill specific jig or could I simply attach the old Rudell jig I have to the table to hold the ball stationary while drilling.  By the way I already have two sets of bits and tons of other shop equipment, I'm only looking at the mill drill.

bluerrpilot

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Re: Milling Machines
« Reply #3 on: April 17, 2008, 07:38:25 PM »
The jig and ball stay stationary and the mill table moves on both axis. Front and back is forward and reverse pitch. Right and left is lateral pitch.

If you were to use the Rudell jig (the top half) then the table would remain stationary and the jig would do the x and y moving.

If you look at the picture of the jig I posted. You will see that its to pieces. Top and bottom. The bottom with the cranks are the same as the tables on the mill press. the bottom half stays bolted to a drill press and the top half moves the ball thats clamp to it.


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Team HammerHead
2008 USBC Nationals
ABQ, NM


"USBC is concerned that technology has overtaken player skill in determining success in the sport of bowling"

Edited on 4/17/2008 7:40 PM

Edited on 4/17/2008 7:42 PM

mw11x300

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Re: Milling Machines
« Reply #4 on: April 17, 2008, 08:29:36 PM »
Thanks a lot I appreciate the info.

fluff33

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Re: Milling Machines
« Reply #5 on: April 17, 2008, 11:44:51 PM »
If you really want to be accurate you should have digital readouts for both the x and y axis.  This is the best way to duplicate oval thumbs.  Without digital readouts, you will not be as accurate.

bluerrpilot

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Re: Milling Machines
« Reply #6 on: April 18, 2008, 01:01:55 AM »
quote:
If you really want to be accurate you should have digital readouts for both the x and y axis.  This is the best way to duplicate oval thumbs.  Without digital readouts, you will not be as accurate.


That is incorrect. The scale on most mills is accurate to .001" Most digital readouts read to .0005" Which is half that, but are only accurate to .001" as well. It really doesnt matter much anyway. NOBODY could feel the difference even if you were off by 5 times the difference

I have repaired, calibrated and sold most precision measuring and manufacturing equipment for a living. Including digital scales and readouts.
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Team HammerHead
2008 USBC Nationals
ABQ, NM


"USBC is concerned that technology has overtaken player skill in determining success in the sport of bowling"

khamûl

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Re: Milling Machines
« Reply #7 on: April 18, 2008, 01:17:10 AM »
quote:
If you really want to be accurate you should have digital readouts for both the x and y axis. This is the best way to duplicate oval thumbs. Without digital readouts, you will not be as accurate.




$70 or so well spent, imo, for those that want to replicate ovals...

http://www.use-enco.com/CGI/INPDFF?PMPAGE=328&PARTPG=INLMK32

for those times when the digitals go out (pesky batteries) or when the allen nuts get a little loose on the table dials. lol, good times.

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good luck and good bowling.


sunsetlefty

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Re: Milling Machines
« Reply #8 on: April 18, 2008, 08:53:46 AM »
mw11x300,

pm sent...........
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Mike Austin

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Re: Milling Machines
« Reply #9 on: April 18, 2008, 09:21:15 AM »
I wouldn't want to use a Rudel type jig on a milling machine.  I don't think it can hold the ball properly while making the ovalling cuts.  Definitely would not want those little clamps holding the ball while trying to cut plug down either.  I've thrown balls off the press while cutting plugs down with better jigs.  Milling machines are very powerful.  Get the best/strongest jig you can afford.

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