JACKIE SCHMIDT
Plastic
- Joined
- Feb 14, 2008
- Location
- Houston Texas
We do quite a bit of this, on new installations and repair.
Since the Reduction Gear in a vessel takes the thrust of the propeller, it is customary to install Body Fit Bolts to hold it solidly in place.
Here is a simple setup We have employed for years. It allows me to drill and ream precision holes in which we custom fit bolts with about .001 interference fit.
These particular bolts are for a new Reintjes 1200 HP reduction gear.
These bolts have a .937 body with a 7/8 NF thread. I machine the bolts from 1 inch grade 8 bolts.
The angle drill is a Ingersol Rand #3. We use a #4 and #5 for larger holes.
To install, I just dip each bolt in Liquid Nitrogen for about 5 minutes and slip them in.
This is just another way to accomplish a fairly difficult job in a out of the shop environment
YouTube
https://www.practicalmachinist.com/...room-88d82c2b-3f80-45ef-ace2-f2b709cda257.jpg
https://www.practicalmachinist.com/...room-ac1144d2-b95b-460a-8c2c-629a34a7c34e.jpg
https://www.practicalmachinist.com/...room-1f43ef33-92d5-4105-b301-e9ca8506703d.jpg
https://www.practicalmachinist.com/vb/attachment.php?attachmentid=289220&d=1590023232&thumb=1&stc=1
Since the Reduction Gear in a vessel takes the thrust of the propeller, it is customary to install Body Fit Bolts to hold it solidly in place.
Here is a simple setup We have employed for years. It allows me to drill and ream precision holes in which we custom fit bolts with about .001 interference fit.
These particular bolts are for a new Reintjes 1200 HP reduction gear.
These bolts have a .937 body with a 7/8 NF thread. I machine the bolts from 1 inch grade 8 bolts.
The angle drill is a Ingersol Rand #3. We use a #4 and #5 for larger holes.
To install, I just dip each bolt in Liquid Nitrogen for about 5 minutes and slip them in.
This is just another way to accomplish a fairly difficult job in a out of the shop environment
YouTube
https://www.practicalmachinist.com/...room-88d82c2b-3f80-45ef-ace2-f2b709cda257.jpg
https://www.practicalmachinist.com/...room-ac1144d2-b95b-460a-8c2c-629a34a7c34e.jpg
https://www.practicalmachinist.com/...room-1f43ef33-92d5-4105-b301-e9ca8506703d.jpg
https://www.practicalmachinist.com/vb/attachment.php?attachmentid=289220&d=1590023232&thumb=1&stc=1