A wide disc of hardboard (HDF) was cut in a rough circle on a band saw. The circle was refined on a sander. First, the sloppy edges were taken down to the edge of the circle. Second, the whole disc was spun on the belt sander to wear off the uneven edges. This technique allowed for larger circles than possible with a hole saw. It was shown to me by another hack space member who happened to be making wooden discs as well.
Once a good disc was formed a hole cutting drill bit was used to remove the inner area for the motor. This was the same bit used previously when a hole was cut in the gear board. Fortunately, no one had adjusted it since it was used. The disc was clamped down and cut from both sides to reduce hole blowout.
The motor and the mending brace adapters were placed in the donut-shaped hardboard and holes were marked where the bolts would be placed. Those holes were dented with a scratch awl, given pilot holes, then drilled from both sides.
All the bolts aligned and the plate, motor, and gear were fastened back on the board. The increase of 1/4" (6mm) was enought make the gear teeth mesh together. Power was applied but there was no appreciable motion. This was hopefully due to the power supply which was rated for 2A. The motor drew 1.4A unloaded. Another power supply should be tested soon.
Downloads:
The rest of the posts for this project have been arranged by date.
First time here?
Completed projects from year 1.
Completed projects from year 2.
Completed projects from year 3.
Disclaimer for http://24hourengineer.blogspot.com/
This disclaimer must be intact and whole. This disclaimer must be included if a project is distributed.
All information in this blog, or linked by this blog, are not to be taken as advice or solicitation. Anyone attempting to replicate, in whole or in part, is responsible for the outcome and procedure. Any loss of functionality, money, property or similar, is the responsibility of those involved in the replication.
All digital communication regarding the email address 24hourengineer@gmail.com becomes the intellectual property of Brian McEvoy. Any information contained within these messages may be distributed or retained at the discretion of Brian McEvoy. Any email sent to this address, or any email account owned by Brian McEvoy, cannot be used to claim property or assets.
Comments to the blog may be utilized or erased at the discretion of the owner. No one posting may claim property or assets based on their post.
This blog, including pictures and text, is copyright to Brian McEvoy.
2016-11-17 (Th)
Circle cut from hardboard
Once a good disc was formed a hole cutting drill bit was used to remove the inner area for the motor. This was the same bit used previously when a hole was cut in the gear board. Fortunately, no one had adjusted it since it was used. The disc was clamped down and cut from both sides to reduce hole blowout.
Cutting inner part of motor riser plate
The hollow disc felt like a frisbee so I managed to get a mid-air shot
The motor and the mending brace adapters were placed in the donut-shaped hardboard and holes were marked where the bolts would be placed. Those holes were dented with a scratch awl, given pilot holes, then drilled from both sides.
Drilling the adapter plate
All the bolts aligned and the plate, motor, and gear were fastened back on the board. The increase of 1/4" (6mm) was enought make the gear teeth mesh together. Power was applied but there was no appreciable motion. This was hopefully due to the power supply which was rated for 2A. The motor drew 1.4A unloaded. Another power supply should be tested soon.
Gear board with motor on the adapter plate
Downloads:
- Gears
- Panel layout PDF or DWG
- S Symbol Plate OpenSCAD source or STL model
- Ultrasonic flush-mount source or STL
- Internal ring gear
- Spring hub includes source and STL for metric and imperial
- 1 Small Arduino Micro
- 2 Stereo potentiometers (10K)
- 4 Multi-turn potentiometers (10K)
- 2 Twelve volt DC motors
- 1 Dual H-bridge
- 2 Ultrasonic distance sensors
- 1 Sine wave generator or the Amazon version
- 1 Voltage Regulator
- 1 Twelve volt three amp power supply
The rest of the posts for this project have been arranged by date.
First time here?
Completed projects from year 1.
Completed projects from year 2.
Completed projects from year 3.
Disclaimer for http://24hourengineer.blogspot.com/
This disclaimer must be intact and whole. This disclaimer must be included if a project is distributed.
All information in this blog, or linked by this blog, are not to be taken as advice or solicitation. Anyone attempting to replicate, in whole or in part, is responsible for the outcome and procedure. Any loss of functionality, money, property or similar, is the responsibility of those involved in the replication.
All digital communication regarding the email address 24hourengineer@gmail.com becomes the intellectual property of Brian McEvoy. Any information contained within these messages may be distributed or retained at the discretion of Brian McEvoy. Any email sent to this address, or any email account owned by Brian McEvoy, cannot be used to claim property or assets.
Comments to the blog may be utilized or erased at the discretion of the owner. No one posting may claim property or assets based on their post.
This blog, including pictures and text, is copyright to Brian McEvoy.
2016-11-17 (Th)
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