nik
spending too much on rocks
![*](//storage.proboards.com/forum/images/stars/star_teal.png)
Member since May 2019
Posts: 315
|
Post by nik on May 29, 2019 16:21:17 GMT -5
Hello everyone, and thank you for the knowledge that I have already gathered paging through the forum.
I recently purchased a Poly D14 arbor with two 8x3 drums and a 1/2 HP 1725 rpm motor, which should arrive in a few days. By all that I can find online about them, it seems like a very well built arbor, but I feel a bit limited by the usable shaft length outside the bearings. Would there be any real problems with swapping out the shaft for a longer one, say between 18-20" over all. Any input would be much appreciated
|
|
|
nik
spending too much on rocks
![*](//storage.proboards.com/forum/images/stars/star_teal.png)
Member since May 2019
Posts: 315
|
Post by nik on May 29, 2019 17:35:12 GMT -5
That is way more than I had in mind. Are you still running the 3/4" shaft
|
|
|
Post by stardiamond on May 29, 2019 19:12:19 GMT -5
I did something similar on my stardiamond machine. Removed the drum and replaced with wheels. I bought some DP Titan spacers but I could have made something. When the machine has drippers and are no longer over the wheels, they need to be moved or use recirculated water using geysers and aquarium pumps. I also changed mine so that I could use genie trays under the wheels so I could start with clean water/
|
|
AzRockGeek
has rocks in the head
![*](//storage.proboards.com/forum/images/stars/star_pink.png) ![*](//storage.proboards.com/forum/images/stars/star_pink.png)
Member since September 2016
Posts: 639
|
Post by AzRockGeek on May 29, 2019 19:47:06 GMT -5
I used a 3/4" shaft, I probably should have went with a 1" and replaced the bearings due to the length, but I have no issues with vibrations.
|
|
nik
spending too much on rocks
![*](//storage.proboards.com/forum/images/stars/star_teal.png)
Member since May 2019
Posts: 315
|
Post by nik on May 29, 2019 20:02:32 GMT -5
I used a 3/4" shaft, I probably should have went with a 1" and replaced the bearings due to the length, but I have no issues with vibrations. Is the OD of the stock bearings big enough to accommodate a 1" shaft without using some exotic low profile bearing
|
|
AzRockGeek
has rocks in the head
![*](//storage.proboards.com/forum/images/stars/star_pink.png) ![*](//storage.proboards.com/forum/images/stars/star_pink.png)
Member since September 2016
Posts: 639
|
Post by AzRockGeek on May 29, 2019 20:21:17 GMT -5
It would have to be researched if a off the shelf bearing is available, but I have seen a D14 with 1" shaft.
|
|
nik
spending too much on rocks
![*](//storage.proboards.com/forum/images/stars/star_teal.png)
Member since May 2019
Posts: 315
|
Post by nik on May 29, 2019 20:38:53 GMT -5
It would have to be researched if a off the shelf bearing is available, but I have seen a D14 with 1" shaft. Good to know. Three of the sintered wheels I found are 32mm bore, and that would be a lot of bushings. My thinking now is to get a shaft made that is 32mm on the left side then 1" through the bearings and out the right side
|
|
nik
spending too much on rocks
![*](//storage.proboards.com/forum/images/stars/star_teal.png)
Member since May 2019
Posts: 315
|
Post by nik on Jun 1, 2019 5:42:52 GMT -5
The arbor has arrived, in remarkably good shape. There is almost no visible wear on the pulleys, and the bearings are velvety smooth. Just a bit of light surface corrosion on the bottom of the shell casting. The bearings are 42mm (1.6535")OD, so installing a 1" shaft without doing some machine work on the casting is probably not practical.
The current version of the plan is to use a 3/4" shaft somewhere around 20" to 24" long with 8x1" 110 grit, 5x1.25" 400 grit, and 5x1.25" 600 grit sintered wheels on the left, and an 8x3" expanding drum plus provisions for 6 or 8" flat laps or 1/4 20 threaded polishing pads on the right. Power is coming from a 3/4 hp 200-3600 rpm industrial sewing machine servo motor, with the pulleys set to turn the shaft at about half motor speed.
I found a 3/16 thick 20x30" stainless griddle plate with 2" sides and a drip trough at one of the local Asian grocery stores for less than I could buy the material, so that will be the drip pan/base and the hood will be bent up from 0.090" aluminum sheet.
Water is going to be single pass, gravity feed using nylon irrigation valves and vinyl tubing for now. possibly a rigid copper setup later, but the budget has already been blown.
|
|