Fill in my knowledge gap :)

[Davek0974]

The slot is pretty wide so i would position the material to place the eventual slot over a run of bed holes, machine the slot plus the two small ovals, then fit clamps into the slot and finish the rest of the front.

As you said, then place blocks on bed touching the finished edge, flip over, clamp around the edge and machine the pocket T.

Seems to make sense now, will finish the drawings and do a simulation or two :)

Thanks

[Davek0974]

A little more gap to fill...

How do you program an edge chamfer or break an edge in CNC??

I have Aspire but no idea on this one?

I would guess at using a 45deg tool but is there a method to offset the correct amount and set the depth?

[JAZZCNC]

A little more gap to fill...

How do you program an edge chamfer or break an edge in CNC??

I have Aspire but no idea on this one?

I would guess at using a 45deg tool but is there a method to offset the correct amount and set the depth?

The Cam software will most likely have Chamfer toolpath which will give parameters such as chamfer length then take the tool size/angle and do the offset for you.

If not then it's bit of math for depth/length which I've no clue about and setting an offset. To save my brain I just use Cad to show me how deep/offset etc.

[needleworks]

A little more gap to fill...

How do you program an edge chamfer or break an edge in CNC??

I have Aspire but no idea on this one?

I would guess at using a 45deg tool but is there a method to offset the correct amount and set the depth?

I am no expert by any stretch of the imagination, and I also struggled with this one ! What I ended up doing was just a case of simple maths, taking your 45deg cutter, You could assume that 0, 0, 0, puts the tip of the cutter right on the edge of your part, I then just told mach3 that I was using a 4mm cutter (doesn`t matter what size you insert here as long as it corresponds with your depth of cut) and used a cutting depth of 2.5mm. This in turn would put a .5 chamfer (in my case just a regular countersink) right round the edge of your part. If you required a larger chamfer, then simply lower the cutter to a depth of 3mm. Hope you can understand what I`m trying to say here

[lucan07]

Only do this in Fusion but just use a 2d chamfer and select a chamfer mill to suit.

[Davek0974]

Thanks all, seems this function is a downloadable option for Aspire but as I'm running an older version of the software it's not available for me, oh well, looks like i'll be needing that math knowledge I didn't learn at school again....


:)

Yes the explanations make sense and I have an idea now of what to try.

[routercnc]

Hi Dave,

Just knocked this together to help work it out.

You can use one of the 3 look up tables depending on if the chamfer tool is 90, 60, or 45 deg.

Then assuming you use a notional tool diameter of 4mm as suggested above by needleworks in the CAM tool definition, then you just need to look up the required chamfer distance you require (C) and read off the depth of cut required (P) and enter this value into the CAM software.

I've not tried this out but I think it is OK. Please check on a scrap piece first (!).

Any errors spotted by anyone let me know . . .

[needleworks]

Hi Dave,

Just knocked this together to help work it out.

You can use one of the 3 look up tables depending on if the chamfer tool is 90, 60, or 45 deg.

Then assuming you use a notional tool diameter of 4mm as suggested above by needleworks in the CAM tool definition, then you just need to look up the required chamfer distance you require (C) and read off the depth of cut required (P) and enter this value into the CAM software.

I've not tried this out but I think it is OK. Please check on a scrap piece first (!).

Any errors spotted by anyone let me know . . .

Yes, that explains it a lot clearer mate I should also have said that I use cambam for my toolpaths (not mach3 as I said in my previous post) like many, I just can`t get to grips with fusion 360 cause it always seems to mess up somewhere.

[Davek0974]

Looking for suggestions on how to do the CAM for a part i make batches of manually at present, it's a round shaft with a square peg on the end. I have the vise mounted usually in one place for long periods so a G5x offset seems good, I can ref off the fixed jaw front and end.

It's not shown in my sketch but the radius of the tool is used to create a radius at the point where the square peg meets the body - just run the tool in from the end.

The part is held in a square 5C collet block at a fixed depth, the vice is fitted with an end-stop so pretty much all settings are repeatable and fixed.

I am looking to machine two sides and the end, rotate the block 90deg and re-run.



Just looking for ideas :)

[Boyan Silyavski]

Hi Dave,

Just knocked this together to help work it out.

You can use one of the 3 look up tables depending on if the chamfer tool is 90, 60, or 45 deg.

Then assuming you use a notional tool diameter of 4mm as suggested above by needleworks in the CAM tool definition, then you just need to look up the required chamfer distance you require (C) and read off the depth of cut required (P) and enter this value into the CAM software.

I've not tried this out but I think it is OK. Please check on a scrap piece first (!).

Any errors spotted by anyone let me know . . .

While we are here. Just in tune with your calculations /that i will have to save somewhere/ - i needed a couple of times to calculate a V cutter flute length /FL/. Reason was i have V cutters that cut deeper than their flutes, a mix between V cutter and spiral flute mill, where the flute ends at shank width. Wow, it took me some time to figure how to calc these so i could draw them properly in program. Properly means exactly without any errors.

I read here how to calculate the flute length Link,
the formula for sides of Isosceles Triangle, so i came up with FL=((shank diam - tip diameter)/2)/cos((180-vertex angle)/2)