4th axis question

[cobra95kev]

Hey guys,

I uploaded a small STP file (4thaxisquestion.stp in X2 files folder) of a part our production manager wants to run on our 4th axis.

 

There is a little difference of opinion between us on how this part will come out if we cut this on a 4th axis vertical rotating about X and keeping the y at centerline of the part and only moving X about the profile as it rotates.

 

If you look at the top of the part at the .472 radius bulb it kind of dips as it transitions from the 2.0" OD to the 1.506" ID. If I cut this as I stated above will that dip show up?

 

I have never cut a part with the 4th axis rotating

is there any tips you guys could give? Would this be a good part for axis substitution?

 

Thanks a bunch

[crazy^millman]

Since it looks like a Cam surface to me Rolldie chook will be your best friend on this one. I will say that no Y will have to move on apart like this. Email John Summers and CNC he is the king of these types of Parts.

 

HTH

[cobra95kev]

Thanks Ron,

I will do that.

[Slydman]

Kevin

 

I have uploaded (slydman_4thaxisquestion.mcx) you will find another solid that i created from the original solid to compare.

 

The way that has to be machined is on your 4th axis setup as you described, you need to make a 2d XY movement to follow the shape curve than make a rotation 90deg and redo the same movement.

 

You will get exactly what you need

[cobra95kev]

Thanks a bunch Slyd

 

[Mike@Apollo]

Unless I'm mistaken, this part would be a simple contour path, then transform rotate at 90 degree increments.

[crazy^millman]

I gave the part a quick glance and parts I have seen like this drive a cam or having something following them. I do not have a print and without knowing 100% what the part is I would always treat it this way unless otherwise directed it is just a simple contour. The suggestion it would need Y axis milling makes me really think that is the case on this part. I could be wrong since I do not have the print, but I will always error on the side of caution then on the side of thinking anything is a slam dunk part.

 

HTH

[John Summers]

I don't think this part is even drawn correctly, and I think Ron is right in thinking it is a cam. You can't really make this part correctly unless you know the diameter of the follower. Then unroll the geometry, offset by the follower radius, and use THAT as the drive geometry. You might have to use stock thickness if the cutter isn't the same diameter as the follower.

[cobra95kev]

I sent a PDF copy of the drawing to John,

I do think it is modeled as drawn, we got a copy from the customer and my model matched thiers.

 

I ended up just standing it up in a vise on a vertical and just doing a surface finish blend.

 

Done deal.

 

Thanks everyone.

[crazy^millman]

Well glad you got it, but I will always go to the side of caution. Thanks for taking a look at it John.

 

[neurosis]

quote:

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If you look at the top of the part at the .472 radius bulb it kind of dips as it transitions from the 2.0" OD to the 1.506" ID. If I cut this as I stated above will that dip show up?

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Looking at this thing I would say no. Looking at it twice and then three times, Mike@Apollo has it nailed.