Headstock Dividing Attachment from Hemingway

This topic has 11 replies, 7 voices, and was last updated 10 November 2019 at 17:57 by not done it yet.

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10 November 2019 at 09:46 #436662
Mark B
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@markb43031
Has anyone made the Headstock Dividing Attachment (HDA) from Hemingway kits for a Myford lathe?

http://www.hemingwaykits.com/acatalog/Headstock_Dividing_Attachment.html

Is this considered to be a good option and are there any photos of it around?

I'm considering this for use with a stepper motor and Division Master style stepper driver which I've made for dividing on another machine.
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10 November 2019 at 09:46 #26950
Mark B
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@markb43031
10 November 2019 at 10:50 #436668
Alan Hopwood
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@alanhopwood63369
One of the best things you can make. The number of times I've called on it for all sorts of graduating jobs etc. is quite remarkable. I even produced a vernier scale for the thimble of the GHT cross-slide dial. This meant that I could read in tenths of a thou and still work in 1/16ths of an inch .
10 November 2019 at 10:55 #436669
not done it yet
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@notdoneityet
Loads of pics on ‘goggle’ images. No idea if it is any better, or worse, than other solutions.
10 November 2019 at 11:19 #436672
ega
Participant
@ega
One of the first GHT items I made and has had considerable use.

Can you elaborate on your ideas for using it with a stepper motor, etc?
10 November 2019 at 11:33 #436674
ASF
Participant
@asf
Great tool.

I made mine from plans from a model engineers magazine (I think) as i already had some dividing plates.

So a small modification and all was good.

Great for making dials where you need to turn then engrave a line.
10 November 2019 at 11:56 #436677
Mark B
Participant
@markb43031
Thanks for the replies. Its good to hear it is a good option. I want to use it with a stepper motor as very often the divisions I want to achieve are not possible with the dividing plates. I will be cutting clock wheels.

I have made myself a Raspberry Pi controlled stepper motor already, but I want to perform the divisions on my lathe so I can turn blanks for clock wheels and cut the teeth without needing to transfer to another machine. This helps to keep the wheels perfectly concentric which is important for accuracy.

The link below shows the controller I've made:

Controller details

Edited By Mark B on 10/11/2019 11:57:24
10 November 2019 at 12:55 #436685
Les Jones 1
Participant
@lesjones1
I have done a similar thing using the rotary table to drive the spindle. The table is attached with an adaptor that fits into the end of the spindle and the drive is transmitted with an expanding collet. The spindle supports the weight of the rotary table and the rotary table base is prevented from rotating with an arm attached to a fixed point on the lathe.

The pictures above show it mounted on my Chester DB10G. The second picture shows how the rotary table base is prevented from rotating.

Les.
10 November 2019 at 16:55 #436715
ega
Participant
@ega
Mark B:

Thanks for your reply.

I am no programmer and controllers are some way above my head. I am however under the impression that any number of divisions is possible with the HDA, using the micro attachment where the division plates alone won't do the job.
10 November 2019 at 17:15 #436720
Mark B
Participant
@markb43031
I agree using a micro attachment would make it possible, but using the stepper motor makes it less likely for you to make an error. Even using division plates, its easy to make a mistake (caused by the phone ringing part way through for example) and you can end up with 1/2 a tooth at the end of your cutting operation.

Anyway I've decided to go ahead and get the Hemingway kit… I'll post my results when I've got it working.
10 November 2019 at 17:31 #436724
Michael Gilligan
Participant
@michaelgilligan61133
Posted by Mark B on 10/11/2019 17:15:46:

I agree using a micro attachment would make it possible, but using the stepper motor makes it less likely for you to make an error. […]

.

In principle, I don’t think there would be a problem fitting a stepper motor to the micro attachment; it’s just a two stage worm gearing.
… In practice, it may be tricky to get the proportions right.

MichaelG.
10 November 2019 at 17:57 #436732
not done it yet
Participant
@notdoneityet
Can’t be foolproof for all lapses of concentration while on the job, but the phone ringing part-way through the cutting operation is very easily avoided. Just turn the thing off!
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