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Thread: An unusual Hercus!
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29th Nov 2021, 09:15 PM #1Diamond Member
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An unusual Hercus!
Can anyone guess what this is?
IMG_2241.jpg
It has a large pinion-driven tailstock:
IMG_2238.jpg IMG_2239.jpg
that fits an MT3 in its 2" diameter.
and is driven by a 2HP motor with a wide (maybe 1.5") flat belt:
IMG_2240.jpg
I'll add more photos as we restore the machine
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29th Nov 2021, 09:59 PM #2Most Valued Member
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I would think some kind of gun drill?
Sent from my SM-G973F using Tapatalk
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29th Nov 2021, 10:58 PM #3Golden Member
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Internal grinder mechanically driven, the table is stroked back and forward by something like a shaper mechanism. Used for grinding draw dies.
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30th Nov 2021, 07:20 PM #4Diamond Member
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lamestllama is close. It is a sort of grinder. Here are today's photos:
IMG_2246.jpg IMG_2245.jpg IMG_2244.jpg
1st one is a table, which pivots on the two pins at the front of the casting.
2nd one is the bed. It has tracks like a surface grinder.
3rd one is the cross slide. It has a grinding spindle like a crankshaft or camshaft grinder.
Oh, and it has a big solid base:
IMG_2250.jpg
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30th Nov 2021, 09:57 PM #5Senior Member
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Is it a piston grinder?
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1st Dec 2021, 05:49 AM #6Golden Member
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1st Dec 2021, 06:11 AM #7Diamond Member
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You are both CORRECT !
Back in the day, they were called "piston finishers."
Every little garage had one, and pistons were purchased as semi-finished castings – say 30 or 40 thou oversize.
The mechanic would put the appropriate eccentric cam in the machine (A, B or C), and do some precision grinding to size for the state of engine bore wear.
Its owner is still trying to work out how you set it up for the taper, though. The more popular Repco machines had a table that rotated slightly, like most cylindrical grinders. This one has pins holding the table hinges into the slip tray.
Maybe I'll find a manual, somewhere
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9th Dec 2021, 09:15 PM #8Senior Member
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Is there any updates on the piston grinder? I remember one on gumtree a long time ago and they were only asking $200 for it or somewhere close to that figure, It was advertised as a garden ornament.
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9th Dec 2021, 09:17 PM #9Diamond Member
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still in pieces on the workshop floor. Awaiting paint.
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13th Dec 2021, 12:47 PM #10Golden Member
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25th Jan 2022, 07:32 PM #11Diamond Member
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Some two-pack paint on the base castings:
IMG_2409.jpg IMG_2410.jpg
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25th Jan 2022, 11:58 PM #12Most Valued Member
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What are you going to use it for when it's restored, or is it a conversational piece??
Nice work by the way.
KrynTo grow old is mandatory, growing up is optional.
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26th Jan 2022, 08:40 PM #13Diamond Member
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27th Jan 2022, 06:34 AM #14Most Valued Member
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That's good to know, there's nothing like keeping history alive.
Will you be making the pistons too, or will you grind down std. ones down to suit?
Sorry about the want pictures, got the shakes this morning, and can't delete it
KrynTo grow old is mandatory, growing up is optional.
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27th Jan 2022, 08:22 PM #15
Hi Kryn, Nigel, Guys,
Actually I too would like to see some pictures of the finished machine ! It would be interesting to see and get an Idea of how the machine works.Best Regards:
Baron J.
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