Final Machine Water Jet parts

[DTHOMSON]

We plan to have some larger parts precut on a water jet and leave about .10 on the surface and finish off on our machining center. Has anyone had problems finish machining parts that have been rough cut by a water jet? Any problems with abrasive being embedded in the material and chewing up cutters? Thanks for any comments!

[RRICH]

   We do it everyday, have not noticed excessive wear on tooling. We machine lots of 514 plate and water cut is much nicer on tools than flame cuts with at times surface hard and slag.

[Tinyfxds]

Never had any problems.  We do quite a bit of semi finish water jetting and haven't noticed anything significant when it comes to extra tool wear

[FROZEN]

I have a project for 3 pieces out of 4140 3 inch thick. Plan on leaving .05 per side and finish outside of part that is in clearance. I will let you all know the results.

[Jayson Kramer]

Been doing for years never had any issue. now if you laser or plasma cut well that is a different story in some cases.

[htm01]

you will just have taper if its not 5 axis depending how fast you jet it

[Quickmike]

About how much taper or draft for cutting various thickness in 4140 plate. Say .5,1,2,3 inches.

[jlw™]

The only problem we ever have with burnouts, laser cut or water jet is that it's always ordered out of plate that's just barely thick enough. It presents 2 main problems. 1: workholding. Once we went to magnets this problem went away but often times we had to match profiles from both sides. 2: finishing to thickness. Burnouts in particular warp and sometimes they are not thick enough to clean up.

 

Feed mills will knock the bark off of burnouts very well.

[htm01]

About how much taper or draft for cutting various thickness in 4140 plate. Say .5,1,2,3 inches.

depends on the nozzle, how much pressure the pump has and the speed of jetting.

we have cut 2 1/2 316ss with only .005 taper

[DTHOMSON]

Thank You everyone for your comments. I had never heard of the abrasive from a water jet process being embedded into the surface but needed to hear from the experts. Once again.....I am impressed with the level of help this form provides! Much appreciated!

[Müřlıń®]

About how much taper or draft for cutting various thickness in 4140 plate. Say .5,1,2,3 inches.

We used to get very thick plates waterjet....

 

They would be as much as 6" thick and there is considerable taper on a 6" thick cutout...probably 1/16" and it can go both ways of center line depending on cut direction...

And there can be more in the corner when the machine changes direction....it all depends on the accuracy of the waterjet and the person operating it...

 

We used this process for forging tooling.....I used to design and machine alot of very large crankshaft dies.  for 1500 bucks we could get the waterjet to cut out the part outline and we would use the drop from the center for the punch...