Precision Drill

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Precision Drill

This topic has 28 replies, 11 voices, and was last updated 6 October 2012 at 19:16 by Michael Gilligan.

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4 October 2012 at 23:09 #12009
Michael Gilligan
Participant
@michaelgilligan61133
How to do build one properly !!
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4 October 2012 at 23:09 #100045
Michael Gilligan
Participant
@michaelgilligan61133
I just spotted this little Aciera Drill on ebay; and would be very tempted, if I did not already have a nice little Jones & Shipman.

It is surely an object-lesson in how to engineer precision machines.

Look & Learn !!

MichaelG.

Corrected the hyperlink

Edited By Michael Gilligan on 04/10/2012 23:12:52
4 October 2012 at 23:48 #100048
Ady1
Participant
@ady1
…motor is 3ph and it comes with a small chuck but no key.

I presume that should read 0.3 of a HP

Or am I misunderstanding 3ph
5 October 2012 at 00:06 #100051
NJH
Participant
@njh
Ady

That is the usual abbreviation for 3 phase.

cheers

Norman
5 October 2012 at 00:55 #100052
Ady1
Participant
@ady1
aha!

I hoped my dum question might yield some knowledge

cheers
5 October 2012 at 00:58 #100053
Ady1
Participant
@ady1
Sooo (dum question no.2)

You would have to buy an inverter thingummybob if you bought this

If I plugged it into a standard socket would it blow up?
5 October 2012 at 01:04 #100054
_Paul_
Participant
@_paul_
Posted by Ady1 on 05/10/2012 00:58:08:

Sooo (dum question no.2)

You would have to buy an inverter thingummybob if you bought this

If I plugged it into a standard socket would it blow up?

You dont have to have an Inverter for all things 3 phase, long before Inverter's were popular a couple of capacitors might have been used to get it going on single phase albeit at reduced power.

There are a few good books in the Workshop Practice series on the subject.

Paul
5 October 2012 at 05:54 #100057
Michael Gilligan
Participant
@michaelgilligan61133
Ady,

The reason for using 3 phase motors on machines like this is that they run much more smoothly.

[comparable with a 120° 3 cylinder motorcycle engine, versus a single]

We now have all sorts of other motor options; but when these were built, it was really the only way to go. … My J&S machine even has a "precision balanced" 3 phase motor [definitely one to keep!]

MichaelG.
5 October 2012 at 09:48 #100061
Steve Garnett
Participant
@stevegarnett62550
Posted by Ady1 on 05/10/2012 00:55:07:

aha!

I hoped my dum question might yield some knowledge

Well if it worked for you, I wonder if it will work for me?

Why does the Aceira have two drive belts, one apparently counter-rotating?
5 October 2012 at 11:08 #100066
Andyf
Participant
@andyf
Looking at the second pic, where the cover is off, I think it might be one continuous belt, cunningly arranged so that the pulleys all run in the same direction. . But if that is true, why such complication?

Andy
5 October 2012 at 11:14 #100067
Michael Gilligan
Participant
@michaelgilligan61133
Steve,

I've been wondering about that, myself.

I cannot find any information about this model, but have considered a couple of points:
1. Some Aciera machines were intended for both tapping and drilling
2. Counter-rotating the quill bearing would even-out any wear.
Any other offers ?

MichaelG.

Here is another one on ebay … looks like [1] applies

Edited By Michael Gilligan on 05/10/2012 11:18:55
5 October 2012 at 11:33 #100069
Ian S C
Participant
@iansc
Is one belt crossed? If so that will be the method of reversing. Ian S C
5 October 2012 at 12:11 #100071
KWIL
Participant
@kwil
If you look at the directions, yes it does appear to reverse, is that fork a clutch as well?
5 October 2012 at 12:28 #100074
Andyf
Participant
@andyf
It's one belt, and the spindle pulleys contra-rotate because of the crossover. . The fork between them may push the whole spindle pulley assembly up or down, to engage one pulley or the other with the spindle, perhaps via a dog-clutch above the upper pulley, and another below the lower one.

Andy

Edited By Andyf on 05/10/2012 12:29:12
5 October 2012 at 13:05 #100076
Michael Gilligan
Participant
@michaelgilligan61133
Agreed, Andy

MichaelG.
5 October 2012 at 14:20 #100080
Steve Garnett
Participant
@stevegarnett62550
Thank you for the replies, gents.

Having looked more closely, yes I can now see that it's one belt, and that this provides a convenient reversing mechanism. I'm still not convinced about why you'd want to do this though – the tapping argument doesn't sound very convincing at all, considering the speed this thing will run at. And since it has a 3 phase motor fitted as standard, wouldn't it have been a lot easier to provide reverse running with a simple switchover of two of the windings?
5 October 2012 at 14:58 #100081
Swarf, Mostly!
Participant
@swarfmostly
Steve,

The highest inertia in the system is that of the motor rotor. Reversing the drill by switching would entail the motor (as well as the other moving parts) running down to zero RPM and back up to full speed in the other direction.

Reversing by switching the belt (analogous to 'fast & loose' pulleys) only entails reversing the drill spindle and the pulley(s), much less inertia and hence quicker and less violent in operation.

Hope this helps,

Best regards,

Swarf, Mostly!
5 October 2012 at 20:02 #100100
Michael Gilligan
Participant
@michaelgilligan61133
One small step for Man …

The SwissMachines website seems to be giving up the ghost, but the French pages still work, and I managed to grab a couple of images. [see Album]

MichaelG.

E3 is the Drill

ET3 is the Tapping Machine

Edited By Michael Gilligan on 05/10/2012 20:10:24
6 October 2012 at 00:03 #100116
Steve Garnett
Participant
@stevegarnett62550
Reading the question attached to the ebay item, and looking at Michael's pictures seems to indicate that this is the tapping version of this machine (complete with one stuck in the chuck, apparently), and in that case, the belt switcher makes a bit more sense.

Although all things considered, I'm going to stick with my Tapmatic…
6 October 2012 at 08:43 #100126
Michael Gilligan
Participant
@michaelgilligan61133
Although I am perfectly happy with the direction that this thread has taken; I am surprised that no-one has commented upon what originally attracted my respect.

It's like the proverbial "brick outbuilding" … but built to a very high precision.

Check the capacity; then look at the proportions, the size and weight.

Compare and contrast with typical modern "model engineering" kit.

MichaelG.

.

Edited By Michael Gilligan on 06/10/2012 08:46:09
6 October 2012 at 09:04 #100128
Michael Gilligan
Participant
@michaelgilligan61133
Here are some pictures of the Drill version [E3] with the spindle speeds clearly shown.

By comparison, the Tapping Machine runs at a top speed of only 1750 rpm.

MichaelG.

Edited By Michael Gilligan on 06/10/2012 09:08:19
6 October 2012 at 09:12 #100130
Andyf
Participant
@andyf
You are right, Michael. – the Swiss make some beautiful machinery. I just wish I could afford a quality milling machine like this, also by Aciera, on YouTube. But with me as the operator, it would be casting pearls before swine.

Andy
6 October 2012 at 09:23 #100133
Michael Gilligan
Participant
@michaelgilligan61133
Andy,

Thanks for posting that link.

Now have a look at this from J M Wild

… it's exquisite work.

MichaelG.
6 October 2012 at 11:26 #100140
Chris Trice
Participant
@christrice43267
The main reason the Swiss make such good anything is because they have no natural resources to speak of. The country makes it income by buying in raw materials then adding value to them by turning them into things of excellence before reselling them.
6 October 2012 at 12:34 #100142
Ian P
Participant
@ianp
Posted by Michael Gilligan on 06/10/2012 09:23:55:

Andy,

Thanks for posting that link.

Now have a look at this from J M Wild

… it's exquisite work.

MichaelG.

That is a beautifully executed project and I am in awe of the design and quality of manufacture.

In the article text (page 228) he mentions 'combined needle and angular contact' bearings for the spindle. They are not something I have ever come across, what would they be?

Ian P
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