Adjust feed on arc move?

[Hugh.Venables]

This check box is in Toolpaths, Job setup. I presume it should compensate feedrates around arcs. I tried it once before without success. I just had another go and couldn't get any sense out of it. When the toolpath in on the inside of the arc, the feed rate should slow. When on the outside, it should speed up. The amount of compensation is easily calculated from the ratio of cutter radius to job arc radius. What I get from checking the box is somewhat random, arbitrary, extraordinary, surprising, illogical feed rates. Has anyone managed to get it to work or found another way of achieving the same thing?

Thanks, Hugh.

[DangBubba00]

I found it slows down on the inside of arcs and speeds up on the outside of arcs, but never exceeds the linear feed rate it started from. Seems it uses the linear feed rate at an upper limit, never to be exceeded.

[Hugh.Venables]

At times mine slowed down around the outside and around the inside it slowed to 1/1000 of the linear where it should have been about half.

Hugh.

[Jim Whipple]

Hugh

On the job setup page below the adj feed on arc button is a min feed on arc limit....

That should fix your problem

Jim

[Smit]

Personally I would like to see the adjust feed on arc move placed in the parameter page of future releases of Mastercam, so that each tool could be adjusted independently within an operation. Is that possible?

[Hugh.Venables]

Thanks Jim. It seems to me that the system is calculating the compensations incorrectly (grossly overcompensating). Sure, setting a minimum will stop ridiculously small feeds but the compensations still seem to be incorrect. No one has tried to reassure me that it does work yet, so I presume either no one has tried to use it or it really doesn't work.

 

Smit, I agree, it would seem more appropriate to have it optionable within operations.

 

Thanks, Hugh.

[Jim Whipple]

I've tried it a couple of times but only have a 6K spindle and so can't go really fast anyway. I've not seen the strange feeds you're talking about but have seen the really slow feeds

I agree it would be nice to have on the parameters page though

Jim

[Hugh.Venables]

Thanks Jim. The really slow feeds are the main problem, but some that aren't all that slow are slower than they ought to be. Also slowing down when the cutter is on the outside is hard to understand. I presume it doesn't work. I'll just have to continue to edit them in manually. Took a couple of hours on the last job.

Hugh.

 

[ 08-26-2002, 02:53 AM: Message edited by: Hugh.Venables ]

[P_Scott]

Hugh,

 

The High Feed button does allow for the feed rate to be adjusted with much better results on any number of operations at one time. Simply highlight the operations you wish to adjust and click on the High Feed button in the Ops Manager. This will make the change to the code of those toolpaths and "lock" those values in place. To revert to the original feed rate, "unlock" the operations and regenerate them. HTH

[Hugh.Venables]

Thanks Peter, I'll give it a try.

Hugh.