CarveSmart Stop Pin Drill
"One and done" for your CarveSmart stop pins!
You are a machinist, so I know you place a premium on ease and efficiency ;)
please share with any carvesmart user that you know!
I'm super excited to partner with my friends at AB Tools Inc. on this one! We all know time is money, whether you are a job shop or a solo act. Start saving now.
I'm a huge fan of CarveSmart soft jaws, but I'm always annoyed with the inefficiency of setting stop pins because I need 4 tools (spot drill, drill, reamer, chamfer) to get the job done. Normally this means taking up 4 tool pockets in the CNC and/or having to set up 4 tools if you can't afford to leave them in the machine. Sometimes I just need to put in one pin and it's not worth it. You can even drill holes "off line" on your Bridgeport instead of taking up time on the CNC. Yes, I actually tried it.
I emailed my concept to AB, they offered some suggestions, and I ordered a few prototypes to test for this project. The results exceeded my expectations and I'm excited to share this with my fellow CarveSmart nerds.
- Solid carbide
- 3/8" shank for rigidity
- 118* point angle
The widget I'm using to handle this pre-order is provided by BackerKit. I use their platform for all of my Kickstarter fulfillment so I know it's secure and efficient. It allows me to gauge interest without taking any money up front.
The pre-order runs for two weeks. If we are over 50pcs I will go ahead and place the order with AB Tools. If we are under, the pre-order will be cancelled and your card will not be charged.
Lead time is probably 2-4 weeks after the close of the pre-order. AB needs some time to make the tools, ship them to me, and then I need to ship them out.
All shipments will be via USPS First Class Package. No exceptions.
This tool is a prototype and no warranties or guarantees are implied. I received and tested a number of sample drills in 6061 aluminum. I have no idea how these will perform (if at all) in 1018 steel. We took a plate and drilled 96 holes. Then dowel pins were inserted in holes #1 and #96 to test and compare the hole fit. #nailed-it
The microscope image above shows the tool after making the 96 holes with no significant wear. Sorry about the image quality. My scope has a very narrow depth of field and I was holding my phone camera up to the eyepiece ;)
It should go without saying, use a rigid tool holder since we are trying to spot and drill in a single plunge. A low mass/less rigid tool holder will allow more flex/vibration and produce poor results.
feeds and speeds
I'm no expert, but we used the following (conservative) feeds and speeds for testing. My goal was accuracy and tool life, not speed. Please bear in mind, we are going for a hole that is closer to reamed rather than drilled. No point in going bonkers for a couple of holes. In setting below are just suggestions. You should use your best judgement for the equipment and cutting conditions available to you.
- RPM: 5000
- IPM: 15
- FPT(IPR): .0015(.003)
- DWELL: 36ms (3 spindle rotations @5K RPM)