scollins
Aluminum
- Joined
- Mar 26, 2005
- Location
- Sheffield, Yorkshire UK
I am hoping the machining centre experts can offer some advice.
I am inspecting parts that comprise a laser profiled piece of 15mm thick steel with 2 x 45mm pilot bore holes at 415mm centres. The profile is approximately ‘banana’ shaped. Two bosses 90mm diameter and 25mm thick, bored out at 45mm are then aligned and welded over each hole in the laser cut part.
The final machining operation is to open up the 45mm through bores to 50.00/50.06 first by milling both holes to approx 49.5 then single point boring both holes to size.
The current method on a Haas machine is to approximately locate the part parallel to the X axis, on packers, clamp and then probe each 45mm bore of the laser cut part in turn. I believe these are then assigned as G54 & G55 datums. The machine then machines the 2 bores using these datums. I have been told that the benefit of this method is that the part doesn’t have to be particularly accurately located however it does mean that any error in the hole centres of the laser cut part are repeated on the Haas rather than corrected to precisely 415mm.
The hole positions relative to the ‘banana’ profile are not critical but the hole centres are important.
Is there a way of probing as described above and then compiling a programme using one of the 45mm holes, say the LH side hole, as the X0, Y0 datum, then using the probing results for the 45mm RHS hole to obtain the part ‘alignment’, (effectively calculating the position of a line that intersects the 2 x 45mm holes), and then machining the RHS hole at co-ordinates of X415.00, Y0.0 or their equivalent to obtain the 415mm centres.
This may be run of the mill stuff to some but any advice would be appreciated.
Regards Stephen
I am inspecting parts that comprise a laser profiled piece of 15mm thick steel with 2 x 45mm pilot bore holes at 415mm centres. The profile is approximately ‘banana’ shaped. Two bosses 90mm diameter and 25mm thick, bored out at 45mm are then aligned and welded over each hole in the laser cut part.
The final machining operation is to open up the 45mm through bores to 50.00/50.06 first by milling both holes to approx 49.5 then single point boring both holes to size.
The current method on a Haas machine is to approximately locate the part parallel to the X axis, on packers, clamp and then probe each 45mm bore of the laser cut part in turn. I believe these are then assigned as G54 & G55 datums. The machine then machines the 2 bores using these datums. I have been told that the benefit of this method is that the part doesn’t have to be particularly accurately located however it does mean that any error in the hole centres of the laser cut part are repeated on the Haas rather than corrected to precisely 415mm.
The hole positions relative to the ‘banana’ profile are not critical but the hole centres are important.
Is there a way of probing as described above and then compiling a programme using one of the 45mm holes, say the LH side hole, as the X0, Y0 datum, then using the probing results for the 45mm RHS hole to obtain the part ‘alignment’, (effectively calculating the position of a line that intersects the 2 x 45mm holes), and then machining the RHS hole at co-ordinates of X415.00, Y0.0 or their equivalent to obtain the 415mm centres.
This may be run of the mill stuff to some but any advice would be appreciated.
Regards Stephen