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Thread: Extended centre drill

  1. #1
    SA MAKER's Avatar
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    SA MAKER's Tools

    Extended centre drill

    Having just acquired a mill with a round column the challenge of using different length tools to center drill, drill and ream without moving the head of the machine became apparent. A useful tip I found on the internet was to position the head to suit the longest tool. Given that the quill stroke is only 100 mm. and that the reamer, and the drill are significantly longer than the standard center drill this may be not always be possible. I made an extended center drill by using a piece of 12mm BMS about 100 mm long. Centered and drilled a pilot hole 0.5 smaller than a center drill I had available using this I drilled the end of the shaft because there was not much material to remove the swarf was not a problem. The fit between the shaft and the center drill was surprisingly good. I then secured the center drill in place with locking compound. The performance has been very satisfactory when the drill fails, I will simply heat the end of the shaft with a torch to degrade the locking compound and reverse the drill.
    Extended centre drill-small-0560.jpg

  2. The Following 4 Users Say Thank You to SA MAKER For This Useful Post:

    Jon (04-01-2019), Miloslav (04-01-2019), Scotsman Hosie (04-02-2019), Seedtick (04-01-2019)

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    steamingbill's Tools

    Locking compound

    Good idea ..... well done.

    Am curious ...... is locking compound a specific product or does tha simply mean superglue or 2 part epoxy or loctite ?

    Bill

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    Thanks Bill

    The lockiong compound I refer to is similar to locktite a product called Pratlok I was wary about using brands still new to this. I have seen mention of using super glue in low stress aplications such as this so it may well work.

    Regards
    Cliff

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    Thanks SA MAKER! We've added your Drill Extension to our Drilling and Drill Presses category,
    as well as to your builder page: SA MAKER's Homemade Tools. Your receipt:





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