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Re: Reversing gear problem

 

Dear Pete,

????On my Arceurotrade A1 sized exploded drawing it shows the following starting at the Fixed cover:-

Desc. ? ? ? ? ? ? ? ? ? ? ? ?Part no.

Fixed cover ? ? ? ? ????? ? ?42
Lever Quadrant ? ? ? ? ? ?36
Retaining ring 12 ? ? ? ? 22 ? ( It says there are 3 of them.I assume the 2 others in different parts of the lathe)
Gear 45T ? ? ? ? ? ? ? ? ? ? 45
Parallel Key 3 x 8 ? ?????47
Shaft ? ? ? ? ? ? ? ? ? ? ? ?????46
Key ? ? ? ? ? ? ? ? ? ? ? ? ????322
Mount ? ? ? ? ? ? ? ? ? ? ? ????48 This seems to show a bearing as part of the shaft.
Gearwheel Z20 ? ? ? ? ? ?50 ? ?(It again says 2.?) ?I assume the other one is in another parts of the lathe - on the quadrant.)
Washer M6 ? ? ? ? ? ? ? ? ?51
Screw M6*8 ? ? ? ? ? ? ? ? 52 ? ? (It again says 4.?I assume there are 3 others in other parts of the lathe

The 2 screws (49) holding the mount (48) in place are M5*18.

? ? Go to??This is on the Arceurotrade site in the UK. They sell Seig rather than Real Bull(?) so it should be helpful. You can blow up this drawing.

? ? Best regards,

? ? David

? ? (Nr. Oxford)


From: "Pete Mclaughlin pete_mclaughlin_93555@... [7x12minilathe]" <7x12minilathe@...>
To: 7x12minilathe@...
Sent: Wednesday, 2 August 2017, 16:30
Subject: Re: [7x12minilathe] Reversing gear problem

?
Hi Warren
?In my manual for the 33684 model of the Harbor Freight lathe the shaft #46 goes through the 45 tooth gear part number 45 then through what looks like a washer #22 then through the quadrant plate #36 and ends in the backing plate made of pot metal where it looks like it is peaned to hold it in a fixed non rotating hold in that plate. ?The quadrant plate and 45 tooth gear should turn independently on that shaft #46.

I was hoping someone on the list could confirm this or point out the error of my observation. ?If i am right i will have to replace the shaft, gear and backing plate after i rip the existing shaft out of the backing plate which will destroy then but salvage the quadrant plate and washer.

I hate to destroy something if there is a better way to fix this seized gear.


Thanks for the help
Pete McLaughli n


On Aug 2, 2017, at 2:08 AM, Warren LeMay notebook@... [7x12minilathe] <7x12minilathe@...> wrote:

?
Pete, I dont have a 7x10 but have collected up the HF manuals and after looking at three of them, it appears that the gear in question comes off with that "brass" bearing mount (Drawing # 48 if you have the manual) that is just in front of it.? That gear seems to be mounted on a short shaft that connects it to the smaller gear in front of the retainer.? Both gears are keyed to the shaft.
I suspect what you see peened over on the back side is the pivot for the forward/reverse quadrant (Part #36 called handle mount).
I'm not even sure the gear shaft goes into the casting.
From here, it looks like it would be easy enough to pull the change gears and the mount, and see if the offending gear comes with it.
From the description you gave for the failure, my best guess would be the bearing in the mount failed.? I believe Little Machine Shop lists all of those parts.
......again, best guess from the manuals.......
Warren L


On 8/2/2017 12:39 AM, Pete Mclaughlin pete_mclaughlin_93555@... [7x12minilathe] wrote:
?
The reversing gears on my 7x10 harbor freight lathe33684 have seized. Specifically the black 45 tooth gear shown in this picture.


Does this gear just pull off or is there a sleeve on this shaft the should come off first?

The shaft seems to be pressed into the potmetal frame behind the gear and peaned so it should not come off.

Any help would be appreciated.

Thanks
Pete McLaughlin


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