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9th Jan 2011, 05:19 PM #1Novice
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Proper gearing for 9 inch Hercus A Model
HI Everyone,
I've just got an A model Hercus . I'm seeking to thread cut & during the set-up procedure to get the correct TPI gearbox selection etc. Looking at the gear selection I need a 20 tooth gear to do the pitch I need but I'm not sure if I have a gear missing. To describe what is on the Lathe:
Apart from the gear closest to the head stock gear and the Twin Reverse gears, there is a 56 Tooth Gear ( I believe a compound gear ) that engages the above head stock gears. An 80 tooth Idler gear engaging the 56. Then I have an option of a 40 or 20 tooth gears on the Gearbox shaft that engages the 80 Tooth Idler gear.
I believe I'm a gear short. I think the option of the 40 and 20 tooth gears, required for the differing range of TPI should engage with another gear attached to the 80tooth drive shaft. Can anyone help me and confirm where the 20 & 40 tooth gears should engage to ?
I've taken a picture of the gearing I have which should make it easier to explain what I'm attempting to describe here.
Thanks
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9th Jan 2011, 05:42 PM #2Dave J Guest
Welcome to the forum,
You have come to the right place, as their are some very knowledgeable people here with Hercus machines.
Pipe Clay makes new gears, so he maybe able to help you out if you find one missing.
Your picture didn't show up, just check the size as their is a limit.
http://www.woodworkforums.com/f36/po...ur-post-78760/
Dave
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9th Jan 2011, 06:17 PM #3Product designer retired
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downunderoz,
It might be of benefit to know whether your Hercus is metric or imperial. Being a new member, you may not have a noticed that there is a special Hercus section for just such questions.
It really doesn't matter where you post, so long as you get the appropriate answer.
Ken
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9th Jan 2011, 06:38 PM #4Dave J Guest
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9th Jan 2011, 07:24 PM #5Product designer retired
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Hi Dave,
It took the efforts of Bitza500 and others to have a separate section for Hercus. This took some doing with permission from Neil, the Forum owner.
Traffic back then was thick was and fast with every Hercus owner jumping on board. Many Hercus problems have now been solved resulting in less posts.
I for one, would not like to see it dropped, there would be riots in the streets at the thought.
Ken.
A Hercus head
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9th Jan 2011, 08:08 PM #6Dave J Guest
I understand, as I said I was just thinking out aloud as their doesn't seem to be much traffic and only 13 pages of posts compared to 83 in this section.
Dave
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9th Jan 2011, 08:40 PM #7Turning useful pieces of steel into scrap metal.
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9th Jan 2011, 08:48 PM #8Most Valued Member
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If you have an Imperial 9" lathe you will have a 20 tooth gear or 40 tooth gear attached to the shaft below your reverse tumblers,this is known as the Stud gear.
The Stud gear will inturn run on your 80 tooth idler which inturn will run on your 56 tooth gear,this is known as the Screw gear.
In standard configuration as the Lathe left Hercus you would only need to interchange the 20 and 40 tooth gears to be able to cut all TPI listed on the Quick Change Box.
If you are running the 20 tooth gear the 40 tooth gear would be located on the Screw Gear shaft next to the 56 tooth gear,the 56 tooth gear sits on the Screw shaft closest to the Gearbox and if you were running the 40 tooth gear on the Stud shaft the 20 tooth gear would sit in the position where the 40 tooth gear was.
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9th Jan 2011, 09:09 PM #9Turning useful pieces of steel into scrap metal.
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9th Jan 2011, 09:51 PM #10.
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Amalgamation
I own a few Hercus machines but these days seldom check out the Hercus forum. A year or so ago it was a hive of activity. Derek "Bitza500" Chesworth would post something every couple of days. Ken was a frequent contributor but then he acquired his new "love" interest. There was an abundance of informative discussion.
The advantage of joining forces would be access to a wider knowledge base for all forum members which is the reason why we all are here.
The Hercus Register could be a sticky in this forum, visited by those interested.
BT
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9th Jan 2011, 10:29 PM #11Dave J Guest
I am just like others that have posted, in that I rarely visit the Hercus forum.
It is mainly because I don't own one now, but that means I miss any general machining related threads that are universal and not just Hercus based.
I don't know if it could be done, but it would be good if it was set up that if someone posted over in the Hercus area, it would come up in this Metal work forum as a message like below.
____________________________________
Gearing (The Hercus area)
Dave J
____________________________________
Then clicking on it would take you to the message in the Hercus area.
That way they would still be two separate forums but linked.
Dave
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9th Jan 2011, 10:38 PM #12Most Valued Member
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The Gearing configuration that I have mentioned concerns the 9" A model Hercus with Quick Change Screw Cutting Gearbox,with Imperial Leadscrew.
Other Imperial and Metric Model 9" Hercus lathes would require a different configuration.
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9th Jan 2011, 10:55 PM #13Product designer retired
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AB
Interesting concept, "then he acquired his new "love" interest".
I've paid for the wedding, have got the bed ready, just need to get her home and buy a bloody VFD to drive her.
Ken
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10th Jan 2011, 01:01 PM #14Novice
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Thank you Dave for the welcome and Pipeclay for the answer. It is an imperial model Hercus A model. From your answer I think I have all the gears needed but in the wrong position so I'll follow your advice and direction and place the gears in that order and see what happens.
To answer Ken; -I may be wrong but I thought the A models were all imperial ex factory but I guess the question is relevant as previous owners may have changed to metric gearing and lead screws etc.
Thank you for your assistance. I'll give it go.
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10th Jan 2011, 01:16 PM #15.
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Downunderoz,
There is a photo at the end of the thread "Slotting- A Rough Attempt" that shows the gear configuration on an imperial A. It may help.
Bob.
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