Hi to all,
Our company is looking at a series of high volume steel parts to be run on our multi-spindle screw machines. This family of parts has some high depth-to-drill diameter ratios. The drilling operations will be broken down into 4-5 stations.
For most of our work, we currently use Erickson style DA collet holders.
For the new work with deeper holes, we are looking at a quick-change system that utilizes ER style colllets. We feel that the quick change would be beneficial for changing and resetting drills on these high volume jobs.
The hole diameters range from .093 to .375. Hole depths range from 9 to 16 times the diameter of the drill.
ER-16 collets would cover the range of drills we would currently be using. We could use ER-16 / ER-20 / ER-25 / or ER-32. The cost differential between the above listed styles is minimal.
Due to the fact that we may in the future go to parts that require larger size drills, we are leaning toward the capacity of the ER-32 style system.
Are there any disadvantages going with the larger than necessary capacity? Do you lose some accuracy/concentricity using the ER-32 over the ER-16 system?
Any comments appreciated. Thanks in advance.