I have a project which involves boring delrin and aluminium to 20mm dia, and to a depth of 35mm.
The way I do it at the moment is centre drill > 10mm drill in a Dickson MT1 tool holder > 12mm drill in the tailstock > 8mm CCMT boring bar (12 to 16mm) > 12mm CCMT boring bar (16 to 20mm).
The problem is when I get to boring, I have to pull out 3 or 4 times to evacuate the swarf. Even when I'm near the end with a bit of clearance inside, I'm still holding my breath not to catch some swarf between the inner bore and the tip and ruin the finishing pass. This is an aluminium and plastic issue due to the chip coming off in one long string.
What's a good way to approach boring, and would I be better to get some SDUCR 07 boring bars? The tip has a lot more clearance to the wall, but they start at about 13mm minimum bore.
The way I do it at the moment is centre drill > 10mm drill in a Dickson MT1 tool holder > 12mm drill in the tailstock > 8mm CCMT boring bar (12 to 16mm) > 12mm CCMT boring bar (16 to 20mm).
The problem is when I get to boring, I have to pull out 3 or 4 times to evacuate the swarf. Even when I'm near the end with a bit of clearance inside, I'm still holding my breath not to catch some swarf between the inner bore and the tip and ruin the finishing pass. This is an aluminium and plastic issue due to the chip coming off in one long string.
What's a good way to approach boring, and would I be better to get some SDUCR 07 boring bars? The tip has a lot more clearance to the wall, but they start at about 13mm minimum bore.