Wednesday, December 8, 2010
For starters, note that the brand name on the front cover (this pulls out and is the shaving's tray too...) bears the brand name Hunt Boston.
The length of the unit from the edge of the faceplate / tray is about 7 and 15/16 inches. The width is about 3 and 6/16 inches.
Centered on the back of the unit is a case screw.
On the bottom of the unit should be (unless it fell off or was removed) a label with the model number, serial# and other information.
Note there are two case mounting screws (missing in this photo) in the center also to hold the sharpener case closed and suction cup feet to hold the sharpener still if on a flat surface.
Tuesday, November 30, 2010
Sunday, October 31, 2010
Step 1 - Set up the sharpener as you would when it is ready to use. Tip it slightly forward and tap on the top of the sharpener a few times. This is to shake pencil shaving into the bin. Remove and dump the bin. Unplug the sharpener (safety first!) and turn it over as shown in the picture. Remove the 3 screws from bottom of the case. Yay! somebody already did this one for me! (heh..ok..that was lame)
Step 2- Remove the bottom cover from the case and put it somewhere safely out of the way. Put the mounting screws in this cover (turn it up with the feet down and use it like a holding tray). If you replaced the shavings bin (as shown in the picture), remove it and set it aside until after the repair is complete. Make sure you keep the screws separate from the housing cover screws (will be removed later). Putting the wrong screws in the wrong place can lead to a loose fit and your sharpner may buck and kick instead of running smoothly.
Notice that the shaft on the blade assembly has some flat side sections on it near the end. If you examine the shaft-mount on the gear, you will see that it also has flat portions in the end face that match up with the shaft . This locks the shaft in and keeps it from free-spinning so the gear will drive the blade assembly when it is turned by the motors main drive that engages to this gear.
Wednesday, August 25, 2010
My assumption has been that if you even know your gear is broken, then you know how to open the sharpener and remove/replace a gear. Even if you are not a Jedi Do It Yourselfer, this is not a tough repair. A photo-guide for this is the next project...
Wednesday, August 11, 2010
Clarification on earlier posts - this gear is only for use with the Model 17. The Model 18 replacement part is only interchangeble for use with Model 19.
Wednesday, August 4, 2010
A question came up - is there any kind of retaining clip for this gear? I have not seen one on any of the sharpeners (Model 17, Model 18, Model 19). All of these depend on a good tight fit, and the repro gears fit in the same manner as originals do.
This gear works with Model 18 and Model 19. Installation guide will be available soon (although most folks who know they have a broken gear have already been under the hood and know hwo to remove/replace). Tooling and testing for the Model 17 replacement will be soon...
Monday, August 2, 2010
I am now posting these on ebay with a set price, no waiting on bids or auction end time. The auction on the previous post ended with no takers but this item has been listed again.
Note: correction has been made to this post - the Model 18 part can be used to repair a Model 19 sharpener. The replacement for the Model 17 is very different and NOT replacable by this part. My ebay listings also mention which models are compatible with the item being listed. Sorry for any confusion!
Wednesday, July 28, 2010
Wednesday, July 21, 2010
Monday, July 19, 2010
Parts for Model 17 and Model 19 still in the works...
Monday, July 12, 2010
If you found this blog then chances are you have a Boston Electric Pencil Sharpener - Model 18, and let me guess, it was working great for years until one day, the large gear broke.
This happened to my Dad. I had no clue why he wanted to repair it...why not just buy a new one? After seeing how sturdy this sharpener was built and what a perfect point it makes, I now 'get' why he doesn't want a newer different one.
I searched for parts and no luck. I did have plenty of luck finding other folks online who are in the same boat. Their large gear is broken too... some have even purchased new sharpeners but would still rather have their Model 18 working again.
I will for now spare the boring details about all the experimentation it has taken (and small investment!) but the bottom line is, I was able to reproduce the gear. The copy is made of tougher material, and I am able to make spares as-needed.
The image shown is a pair of repro gears, arranged to show the front and back details of the part. On the front side of the part (right side of photo), the mounting hole for the shaft is a detailed copy of the original. The gear will fit on to the shaft assembly just as the old one did. On the rear side of the part (shown on left side of photo), the center hub spacer and edge detail match the original.
These are working prototypes and have some minor flashing on the back edge of the gear. That does not affect operation and I am working to elminate that. I am re-working the mold to eliminate air bubbles, but that has been minor and non-critical to operation also. These prototypes are made of stronger material than the original and will be available for about 12 dollars.
The next phase of this project is to continue improvements on the casting process and then work on replacements for Boston Model 17 and Boston Model 19 gears.