Lathe Compound Drill

[Jughead]

So I often find myself in a bind when wanting to drill an offset hole in a workpiece. Drilling from the tailstock only allows for holes drilled dead center in the workpiece. I have had this idea floating around in my head for some time now, so decided to get going and see whether it would work.

The idea was to mount a drill in place of the toolpost. However, mounting a normal handdrill was a bit of a mission and I wanted something dedicated to the lathe.

First off was to source a motor, so I paid a visit to our local gate automation go-to guy, who kindly donated a motor from and old Centurion D5 gate motor.

The motor needed a few measurements and modifications, since the mounting method would change completely. The motor was stripped and cleaned.


The front face (top left) which was originally square with 4 mounting holes in the corners, was turned down to just a tad smaller than the motor body.


Then, with measurements in hand, I paid a visit to my friendly machine shop that made the new mounting for the toolpost.


Machined so that it can be flipped over and still be dead center, it fits onto the lathe in place of the toolpost like this.


Or like this


Next was to cut the shaft shorter and turn it down




to accommodate a 3/8 X 24 thread.


Onto which a keyless chuck has been mounted.


I can now drill holes like this.



Next up is to get my indexing wheel sorted.

[DIYSwede]

Nice, clean job for a first entry, and welcome onboard HMT, Jughead!
Some ratings of the motor would be nice.
-Guess it's a 150W unit, with abt 4000 rpm @ 12 V?
Did you use a 3/8 - 24 die, or did you cut the thread in the the lathe?
Also clever to mill the mount so you just could flip it over for radial drilling!

Keep up the good work!
Cheers
Johan

[Jughead]

Nice, clean job for a first entry, and welcome onboard HMT, Jughead!
Some ratings of the motor would be nice.
-Guess it's a 150W unit, with abt 4000 rpm @ 12 V?
Did you use a 3/8 - 24 die, or did you cut the thread in the the lathe?
Also clever to mill the mount so you just could flip it over for radial drilling!

Keep up the good work!
Cheers
Johan

Thanks Johan

The motor is a King Right F7147-E, 12V and 3000RPM. I cannot find any other specs on it but assume it's around 80W. The speed is a little excessive, so will be building a speed control for it in the near future.

Yes, the thread was cut with a die, as I had one and it was the quickest and most convenient.

[DIYSwede]

Closest I've found is the "-H" flavor:

Guess you could compare their physical dimensions to guesstimate your motor's wattage,
and for short, intermittent use you can triple that nominal effect.
A cheapo 24 VDC 15A PWM regulator should get you a cost-effective regulator.

Good luck!

[DIYer]

Thanks Jughead! We've added your Lathe Compound Drill to our Lathe Accessories category,
as well as to your builder page: Jughead's Homemade Tools. Your receipt:

Lathe Compound Drill by Jughead

tags: lathe, drill, tailstock

[Jon]

Congratulations Jughead - your Lathe Compound Drill is the Homemade Tool of the Week!

Good win on a very busy week around here!

Some more nice builds from this week:

Roller Bender by meanwhileinthegarage
Welding Helmet Modification by theeddies
V-Block by celsoari
Sheetmetal Brake by ruxu
Lead Hammer by Philip Davies
Wood Chipper by Vyacheslav.Nevolya
Rock Tumbler by JKeetonKnives
Mini Lathe Carriage Lock by SculptyWorks
Broach by Spira Knives
Lathe Chuck Wrench by gatz
Compact Live Center by SculptyWorks
Notch Cutting Method by rgsparber
Tailstock Die Holder by SculptyWorks
Scissor Lift Table by TomBuilder
Mechanic's Creeper by athomp
Brake by Savage11
Circle Jig by Make Things
Power Cord Reel by HandmadeCreativeChannel
Disc Sander by Foxtrot_
Biscuit Joiner by rep
Sheetmetal Cutter by Kwandotechnic
Gasket Making Method by Catfish
Signal Generator by TilenThaler
Induction Furnace by Itanc
Fish Table Hold Down Lock by Don42
Drum Sander by Mazay
Panel Clip Tool by UPbuild


Jughead - we've added your tool entry to our All Homemade Tool of the Week winners post. And, you'll now notice the wrench-on-pedestal award in the awards showcase in your postbit, visible beneath your username:



You'll be receiving a $25 online gift card, in your choice of Amazon, PayPal, or bitcoin. Please PM me your current email address and award choice and I'll get it sent over right away.

Nice work!

[Jughead]

Over the weekend I realised there was an issue with my compound drill. I had cut the motor shaft down and placed the keyless chuck quite close to the motor body and mounting. This meant that in certain positions, my hand was designed in such a way that I couldn't get a proper grip on the knurled part of the chuck to be able to loosen it.

This is the chuck position.


And this is as close as my hand can get while still leaving room for the other hand to loosen the red collar.


So I decided to make use of this short piece of the shaft that protrudes from the rear of the motor.


First off was to knurl an appropriately size piece of aluminium


Drill a few holes in it. (These where done just because I now can :biggrin


And end up with this


In all honesty, the 2 lines running around the circumference are there because after drilling the small hole for the grub screw, I accidentally turned the lathe on instead of turning the drill off. I just added the second line to make it look as though it was planned. :o Will have to make some type of security feature to prevent that in the future.

When fitted to the motor, it looks like this.


And now makes it possible to hold the one end of the motor with one hand, whilst loosening the chuck on the other end with the other hand.


Oh yes, and the motor now boasts a speed control. It is still in the "loose wiring everywhere" phase, but it will shortly be mounted as it should be. (Excuse the poor camera handling, and the chuck appears to have a bit of a wobble. That is ,however, just the red plastic locking collar. The drillbit is center with no wobble whatsoever.)

[SASocal]

Loving your drill attachment. Thats my next move [ after getting a bigger lathe ] I went down this rabbit hole for the 7x Mini Lathe ..

Indexing wheel for the mini lathe. Uses a printed cinch collet inside the arse end of the spindle. Main Base mounts to the lathe headstock in stock holes for the existing cover. Locking Mechanism cinches down on the two locking nuts of the spindle [ with a plastic part - safe and easy ]





Main Base ...

[Jughead]

Interesting

I am working on the indexer for my lathe. I have already fitted the 72 tooth wheel into the gearbox, but still need to figure out the locking mechanism. My criteria are as follows:

1. Needs to be unlocked in the normal, relaxed position.
2. Effort needs to be made to engage it to prevent it being accidentally bumped or inadvertently placed in the locked position while the lathe is running.
3. Needs to disable the lathe while in the locked position.
4. Needs to have a mechanism to temporarily disengage to change position without unlocking and relocking.

I have some ideas in my head, but need to make a temporary, partial cover for the gearbox to experiment with.

[benkeller3]

Did you 3D print that and if so would share the STLs?

I would love to adapt that to an Emco 5 lathe.