Machine Problem - Rockcliff

[Kammo1]

Sure would love to help Lee but I have still to cross that bridge when my homebrew gets done. I will certainly be holding my breath when it finally gets going as I can assure you that something somewhere will rear its ugly head........ hope it all gets sorted bro

[John S]

kammo,
If you get stuck, give us a shout, I'm only just round the corner.

John S.

[Kammo1]

kammo,
If you get stuck, give us a shout, I'm only just round the corner.

John S.

Hi John, many thanks I will certainly need all the help I can get as I near the completion of my build. How are you ? I saw Adam 4-5weeks ago in Long Eaton and tried to attract his attention but I was on the other side of the road and I didn't want to shout out loud as it was real busy but just wanted to say that I hadn't forgot about giving you a call on my build just been real busy as little un gets all the attention now, keeps us on our toes. I still have your number and would love to meet up with you again as you are certainly a very skillfull knowledgeable gentleman as last time I saw you I thought how great it was talking with someone who knows what he is talking about and if there is anybody I would like to learn from and thats you. I am off work from Wednesday till the following Monday as kids are off school and such and maybe if you are not busy which I'm sure you are I'd like to show you what I've done and have a good chat with what might need to be done next, hope this is ok let me know. Again John many,many thanks for all the help you gave me last time it was a real pleasure "CHEERS!" Laz aka Kammo1

[progomez]

I had a similar problem. 1mm in the y and 2mm in the x. Problem was circles were round but only 1mm shorter than specified.

used mach 3s auto setup. The one where it asks you to go a certain distance and then you measure it. Seems to have worked.

Initially i thought it was backlash but when I changed this it made it worse.

Im using a 8mm threaded rod on all axis and worked out it should be 320 steps per mm. With the mach setup it said I needed 326.xxx on one axis and something similar on the other.

Maybe the threaded rod wasnt exactly 1.25mm.

Anyway problem sorted.

[Lee Roberts]

Hi guys, i will be posting back to you all soon i'm just going over a few things this end first based on what some of you have suggested. The problem was somthing i said i had checked but didnt check properly !

mach 3s auto setup. The one where it asks you to go a certain distance and then you measure it.

What screen is this on please mate, i'm close but not close enuff and i think this could be the iceing on the cake if i could find the damn thing.

[Lee Roberts]

Just a quick update:

I just found the "auto setup" thing i asked for above, its under the "Setting Alt6" tab, then look to the bottom left just above the big red "Reset" button. I will post back later today as per my above post.

[Robin Hewitt]

Are you cutting uphill or downhill? If you cut it oversize to remove the excess then finish cut downhill, tool flex ceases to be an undersize problem because it shies away from the job. May need a second pass at finished size to clear any excess

[Lee Roberts]

Are you cutting uphill or downhill? If you cut it oversize to remove the excess then finish cut downhill, tool flex ceases to be an undersize problem because it shies away from the job. May need a second pass at finished size to clear any excess

What do you mean by downhill/uphill, is this the same as ramping?

[Robin Hewitt]

What do you mean by downhill/uphill, is this the same as ramping?

Hey maybe I just found out what ramping means, a mystery word to me :D

Uphill is CW around internals, CCW around externals.
Downhill vice versa.

Robin

[Mike F]

Robin,

Quite right - uphill cutting is against the rotation of the cutter, downhill, with the rotation of the cutter. So, for internal, downhill cuts this would be CCW and external cuts would be CW. 'Uphill' and 'downhill' milling are synonymous with 'climb' and 'conventional' milling. Some materials are better cut one way rather than the other. Most good CAM software gives you the option of either.

Ramping, on the other hand, has a number of meanings. In terms of actual cutting it can mean the angle at which the tool approaches the work in the Z axis i.e. it enters the material along a slope. Ramping can also be used to express the rate at which a spindle gets up to speed.

Isn't CNC and the English language wonderful????

Mike