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Working with keyed shafts/bandsaw conversion

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I am converting a cheap little 9” bandsaw I had laying around, via a speed reducer, and matching motor. The end result will be a small bandwidth able to cut smaller steel and brass pieces. I have other ways to cut bigger stuff, including a power hacksaw made by machinist at home in the 50s. It’s really cool piece of vintage machinery. It uses an weak motor that likely came out of a washing machine, but makes beautiful cuts through 4” round stock.

I digress, back to the point.

The output shaft of the reducer is 7/8”. The old bandsaw motor was 1/2” and has a gear on the end feeding the bandsaw drive belt. I need to remove the gear and place it on a new shaft and then adapt it to 7/8” to connect it the reducer.

I am having trouble finding a premade reasonably priced adapter. I thought about buying 7/8” prekeyed shaft and machining down one end to 1/2”. I never keyed a shaft myself. I would then use 7/8 to 7/8 coupler. However, I am concerned about the key gap causing problems when turning.

As far as pulling the gear.
1) Freeze motor
2) Heat gear quickly
3) Pull with puller

Suggestions needed but please remember on a scale of 1 to 10, I am a -1 as far as skill goes
 

Comments

I had the same problem during my conversion, and found this( Complete Hydraulic Jaw Coupler w/Spider Series L095 (Coupling) 7/8" x 1/2" Lovejoy Style https://www.amazon.com/dp/B07BQB7MNX/ref=cm_sw_r_cp_apa_i_jsbmCbA86G940 )

I have my conversion posted here, if it helps any.
https://www.hobby-machinist.com/threads/boice-crane-restoration-conversion.75175/
Has a decent pic of the coupler. My sizes were a little different, but am completely happy with the product.
Just use the puller, no need for heat, cool.
I had the same problem during my conversion, and found this( Complete Hydraulic Jaw Coupler w/Spider Series L095 (Coupling) 7/8" x 1/2" Lovejoy Style https://www.amazon.com/dp/B07BQB7MNX/ref=cm_sw_r_cp_apa_i_jsbmCbA86G940 )

I have my conversion posted here, if it helps any.
https://www.hobby-machinist.com/threads/boice-crane-restoration-conversion.75175/ )

Don’t think the Lovejoy style will work, since its split. I need the shaft (reducer->7/8->adapter->1/2->gear) to enter the case unimpeded vía hole in case and directly drive a small belt. Make sense?
 
I am waiting on my puller. Think it’s coming from China. I will let this thread know how the pull goes.

Hey SubtleHustle.. I forgot to tell you..Great Work on your Bandsaw!
 
Thanks submachine. I might be a little slow, but I'm not sure I smell what you're steppin in. Can you post a few pics of what you've got?
 
Ok, this is worth a good laugh. I had most of this stuff laying around.

hole and the mount for the original motor.
7C1464A1-A691-4732-A40E-B69A46A17F69.jpeg

original motor.
BEADE971-845B-44B7-AA48-19DD333DDC96.jpeg

shows the gear motor. It’s almost as tall as bandsaw. Going slower is bigger, go figure.
8D9C8288-35A4-4D47-8D0B-B10ADDD87415.jpeg
 
I made a prototype adapter out of aluminum. If aluminum works Iwill leave it there permanently. Now waiting on gear puller. Thanks everyone for the help. This site and everyone who participates has been a lifesaver for me. I am permanently home alone most of the time due to some medical issues, and this site has allowed me to have fun with machining.

I created the key with this milling contraption I built out of old broken stuff. It’s ok for small stuff. I used it to key the 7/8 side.
IMG_20190105_172006_cce74465795ddbd5cad2f2cc7a5e7d07.jpeg


The final part in aluminum. I didn’t bother cleaning it up.
IMG_20190105_181407_27cd77c5706f85e5134666727797bbdb.jpeg
 
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