Demo Plan
For Drilling Holes To Dimensions
By Rohan Jain
Date:
May 30, 2016
Time of Demo:
2:10 pm - 3:00 pm
Description of Activity:
This task includes center finding to a corner of a part and then center drilling and drilling hole to size. After the hole has been drilled it will be tapped, and then countersunk/ counterbored appropriately to the drawing.
Rationale:
I will show you these functions on the mill because these are the functions I do most often on the mill. Edge finding is used to find the edge of a block, so when we drill we can drastically increase our accuracy. Taping and counter bohring is used to manipulate a hole which is a another feature tool and die makers use very often.
Details of the Activity:
- Wear PPE (safety goggles, boots, coverall etc)
- Clean vice so there is no small metal particles
- Gather all tools needed to finish the part
- Insert block into the vice and tighten the jaws
- Change tool from endmill to drill chuck
- Insert edge finder into the chuck and than tighten chuck using a chuck key
- Edge find the block
- Once finished insert center drill into the chuck and than move table to hole locations and lightly tap against the piece
- Once finished center drilling remove the center drill and insert needed drill bit to finish drilling operation
- Once drilling operation is finished remove the piece from the vice and file the bur of
- Insert piece into the vice and also insert counter syncing tool to counter sync the holes
- Start tap on the mill
- Remove the piece from the mill and than finish the tapping job
- Insert piece back on the mil and start counterboring operation
- Once finished clean up
Required Materials:
1. Edge finder
2. Center Drill
3. 0.201" drill bit
4. 1/4-20 Tap
5. Countersync
6. 0.48" Endmill
Special Instructions for Co-op Teacher:
Please wear safety boots and bring a pair of safety glasses. Don't be afraid to get your hands dirty as we are going to be working with oil metal and other greasy and sticky substances. Also preferably wear something comfortable and a little worn out as it will get dirty