Nathan the Machinist
KnifeMaker / Machinist / Evil Genius
Moderator
Knifemaker / Craftsman / Service Provider
- Joined
- Feb 13, 2007
- Messages
- 17,740
Update: new thread here: http://www.bladeforums.com/forums/showthread.php/1108201-Steel-grinding-disks
Thanks,
Nathan
These are 9" grinding disks made of hardened alloy steel (4130 HRC 44), turned in a way to minimized runout and then balanced. They were made by request in response for a need for industrial quality grinding disks made for professional use.
These are the first to be finished out of a batch of 100 disks. When the batch is finished there will be no more of these.
The last thing I do is spin it up on an unmounted motor and let it coast down. The motor is unrestrained so any vibration or other troubles would have an opportunity to show up here. Video if you're curious:
[video=youtube_share;-b_h7NaZxKg]http://youtu.be/-b_h7NaZxKg[/video]
The manufacturing of these disks was documented on this WIP thread:
http://www.bladeforums.com/forums/showthread.php/1088181
These disks are 8.875" in diameter and mount to a 5/8" shaft. Setscrews are included as is some keystock. The key stock may require some slight fitting etc (you're a knife maker right?)
It is important you tighten the two setscrews properly. This disk weighs over 7 pounds, you want it to stay on the shaft. The setscrews are high quality Holo Krome brand fasteners of domestic origin, the sockets will not easily strip. You should use a hex insert in a screw driver rather than a dinky wire Allen Key, and if in doubt use a drop of blue loctite. The thread is 10-32 if you want to change to different screw type.
I have a few 3/4" bore disks in processes, but they're not ready yet.
In this sale I have 8 flat disks and 8 disks with a 1 degree taper on the face. They are $160 each and shipping is $10 in the USA via USPS priority mail. Be aware that if you're more of a casual user, Beaumont Metal Works has a good quality aluminum disk that may fit your needs for half this price.
Important, please read:
I know that initial demand for these disks may make these first 16 go rather quickly. If they sell out, please be patient and wait for the next sale, I'm not going to run out any time real soon. The balancing process is somewhat time consuming so I am only finishing a few disks every day. I'll try to post a few disks for sale here on Saturdays. I can not take prepayment for an item not ready to ship. Please keep sales in the sale threads to help me keep up with it. Those of you who have bought platens and chillers know how these sales work, but here is how to order a disk:
I need you to please follow these instructions to help me keep up with everything (otherwise folks will fall through the cracks).
1: State your claim in this thread.
2: send me an email (not a private message) carothersknives at gmail dought com
The email should include what you are buying, your BladeForums handle (i.e.: "Nathan the Machinist"), your actual name, your shipping address and your paypal email address.
I will send a PayPal invoice to that email.
3. Pay the paypal invoice. Once it is paid, I will ship your order to the name and address you gave in your order email.
If you don't want to use paypal, we can arrange to send a check.
If there are shortages it will be based upon first come first serve who posts in this thread. I have to do it this way to keep things sane.
Thanks,
Nathan
EDIT:
Thoughts about "runout":
The manufacturing approach I'm using virtually eliminates runout in the disk because the OD, working face and the internal diameter of the bore are all single point turned in the same setup on a CNC turning center. Unlike drilling and reaming, which can create an off center hole, single point boring creates an accurate hole without risk of bias or walking. Cutting the face at the same time sets the working surface perfectly perpendicular to that bore and cutting the OD at the same time also sets that feature perfectly concentric to that bore. Observable runout on the actual disk is almost physically impossible. That said, you could have the most perfect disk in the world, but if it isn't mounted to your spindle properly or if your spindle itself has runout it is still going to wobble. Electric motors are not ultra high precision spindles, they're simply designed to turn pulleys etc without a lot of fuss. Some even have bushings instead of bearings. If you get a disk and it wobbles I can almost certainly guaranty the problem isn't the disk, but I will still gladly refund your money if you will return the disk in prefect condition.
Thanks,
Nathan
These are 9" grinding disks made of hardened alloy steel (4130 HRC 44), turned in a way to minimized runout and then balanced. They were made by request in response for a need for industrial quality grinding disks made for professional use.
These are the first to be finished out of a batch of 100 disks. When the batch is finished there will be no more of these.
The last thing I do is spin it up on an unmounted motor and let it coast down. The motor is unrestrained so any vibration or other troubles would have an opportunity to show up here. Video if you're curious:
[video=youtube_share;-b_h7NaZxKg]http://youtu.be/-b_h7NaZxKg[/video]
The manufacturing of these disks was documented on this WIP thread:
http://www.bladeforums.com/forums/showthread.php/1088181
These disks are 8.875" in diameter and mount to a 5/8" shaft. Setscrews are included as is some keystock. The key stock may require some slight fitting etc (you're a knife maker right?)
It is important you tighten the two setscrews properly. This disk weighs over 7 pounds, you want it to stay on the shaft. The setscrews are high quality Holo Krome brand fasteners of domestic origin, the sockets will not easily strip. You should use a hex insert in a screw driver rather than a dinky wire Allen Key, and if in doubt use a drop of blue loctite. The thread is 10-32 if you want to change to different screw type.
I have a few 3/4" bore disks in processes, but they're not ready yet.
In this sale I have 8 flat disks and 8 disks with a 1 degree taper on the face. They are $160 each and shipping is $10 in the USA via USPS priority mail. Be aware that if you're more of a casual user, Beaumont Metal Works has a good quality aluminum disk that may fit your needs for half this price.
Important, please read:
I know that initial demand for these disks may make these first 16 go rather quickly. If they sell out, please be patient and wait for the next sale, I'm not going to run out any time real soon. The balancing process is somewhat time consuming so I am only finishing a few disks every day. I'll try to post a few disks for sale here on Saturdays. I can not take prepayment for an item not ready to ship. Please keep sales in the sale threads to help me keep up with it. Those of you who have bought platens and chillers know how these sales work, but here is how to order a disk:
I need you to please follow these instructions to help me keep up with everything (otherwise folks will fall through the cracks).
1: State your claim in this thread.
2: send me an email (not a private message) carothersknives at gmail dought com
The email should include what you are buying, your BladeForums handle (i.e.: "Nathan the Machinist"), your actual name, your shipping address and your paypal email address.
I will send a PayPal invoice to that email.
3. Pay the paypal invoice. Once it is paid, I will ship your order to the name and address you gave in your order email.
If you don't want to use paypal, we can arrange to send a check.
If there are shortages it will be based upon first come first serve who posts in this thread. I have to do it this way to keep things sane.
Thanks,
Nathan
EDIT:
Thoughts about "runout":
The manufacturing approach I'm using virtually eliminates runout in the disk because the OD, working face and the internal diameter of the bore are all single point turned in the same setup on a CNC turning center. Unlike drilling and reaming, which can create an off center hole, single point boring creates an accurate hole without risk of bias or walking. Cutting the face at the same time sets the working surface perfectly perpendicular to that bore and cutting the OD at the same time also sets that feature perfectly concentric to that bore. Observable runout on the actual disk is almost physically impossible. That said, you could have the most perfect disk in the world, but if it isn't mounted to your spindle properly or if your spindle itself has runout it is still going to wobble. Electric motors are not ultra high precision spindles, they're simply designed to turn pulleys etc without a lot of fuss. Some even have bushings instead of bearings. If you get a disk and it wobbles I can almost certainly guaranty the problem isn't the disk, but I will still gladly refund your money if you will return the disk in prefect condition.
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