Thank you, I still have so much to learn but through the help of you and many others I feel I have certainly come along much farther than I would be by now. I will be working with Lapping more in the future, My dad has experience with some lapping and is sharing some knowledge with me since posting this video.
When I was working in non-destructive testing and had to accurately measure dendrite structures of a particular type of metal I needed to achieve a mirror like finish. In order to achieve this finish I used a variety grit of sandpaper starting from 400 up to 2500 followed by a glass plate that was covered with some sort of thin felt. I would then wet the felt with a little bit of water and added a suspended diamond slurry. It would take a few minutes, basically an hour, but I always achieved a mirror finish. I made the slurry in house using diamond powder and a few other things. That indicator appeared to be rocking off one corner. Check the indicator plate for parallelism. Might need to be scraped in then lapped. I don’t have a degree in metrology but I worked with engineers who did and they provided me with a truck load of information when it came to polishing metals. One more thought what is the grade of accuracy of your surface plate. A surface plate can cause inaccurate measurements.
Thanks for the tips and advice, I do want to take this plate further and see if I can improve it. I have gotten a lot of great suggestions and advice. The surface plate I have is supposed to be "Grade A" but I question it. It is a cheap one from China. The inspection sheet that came with it was a batch print off and not an actual inspection of this specific plate. Its great being able to learn from those experts in their fields, I am glad you had the chance to learn from some in your career.
I have a pm-932. Basically a large version of your mill. I have noticed a tram issue in the nod I still need to fix and I assume that is your issue too. Sadly there is no direct way to adjust this other than shimming the head. Good luck!
The machines need to be bolted down, & shimmed level. If the machine is in a twist you can think you have an out of tram condition. Now on the other side of this, my 728VT was sent to with .039 of NOD , PM finally agreed to R&R the machine.
I agree, There are no nod adjustments for this machine. Unless I come up with a different workbench, Maybe a steel plate or steel stand to put it on I am not sure how rigid I can make the machine, I think I will always have some out of spec settings but it isnt 40 thou out like Aarons was. It's about time for me to retram or at least check the head tilt again now that its been almost a year using it. You are right, If I had to I could add some shims under the column to adjust the nod. Good luck and thanks for watching.
Deez.....A) try using a heavy oil both under the paper and on top. B) you want flat? Scrape it or do a "blue fit" on it as the old masters would say C) the sphere on the end of the rod for your surface gauge...I was taught that is where the hooked end of the scribe went for storage. I tagged you my last video...I hope it works right. Do you want a video on lapping cylinder bores?
I will try your suggestions on the next attempt at flattening this homemade surface guage/stand. I am familiar wtih scraping but never tackled that. That honestly would be the better way to go for the bottom onf this surface gauge but I dont hvae the equipment and certainly no skills on doing that. Its an interesting process for sure. I need to read up more on the scherical end of that surface gauge. Thanks for tagging me in your last video, If you made a video on lapping cylinder bores id certainly watch it. It will be helpful when I decide to tackle one of the more advanced model engines. Thanks for watching and thanks for the tips.
Without a surface grinder, 3 points on that home made hight gage will take the rock out. Easyer to lap also. You are learning fast Deez. You have a new trade to fall back on. Having fun is everything for now. Good job.
@@fasturn-fc2of I appreciate the kind words. There is so many things to learn, The world of hobby machining,,well machining as a trade, has so many aspects to learn. It's not just about turning metal and making chips.
Deez with that statement, your going to do well ! At TRW / NGC the machinist programed CAD / CAM , did designs and machining parts. Called Cradle to gave. No mechanical engineer did that ! The machinist is pinnacle of craftsman ship. After 50 years in tool n die / aerospace, I learned something new every day. So will you 😊
Really fun watching how far you've come along in lapping and metrology. Great job!
Thank you, I still have so much to learn but through the help of you and many others I feel I have certainly come along much farther than I would be by now. I will be working with Lapping more in the future, My dad has experience with some lapping and is sharing some knowledge with me since posting this video.
When I was working in non-destructive testing and had to accurately measure dendrite structures of a particular type of metal I needed to achieve a mirror like finish. In order to achieve this finish I used a variety grit of sandpaper starting from 400 up to 2500 followed by a glass plate that was covered with some sort of thin felt. I would then wet the felt with a little bit of water and added a suspended diamond slurry. It would take a few minutes, basically an hour, but I always achieved a mirror finish. I made the slurry in house using diamond powder and a few other things. That indicator appeared to be rocking off one corner. Check the indicator plate for parallelism. Might need to be scraped in then lapped. I don’t have a degree in metrology but I worked with engineers who did and they provided me with a truck load of information when it came to polishing metals. One more thought what is the grade of accuracy of your surface plate. A surface plate can cause inaccurate measurements.
Thanks for the tips and advice, I do want to take this plate further and see if I can improve it. I have gotten a lot of great suggestions and advice. The surface plate I have is supposed to be "Grade A" but I question it. It is a cheap one from China. The inspection sheet that came with it was a batch print off and not an actual inspection of this specific plate. Its great being able to learn from those experts in their fields, I am glad you had the chance to learn from some in your career.
I have a pm-932. Basically a large version of your mill. I have noticed a tram issue in the nod I still need to fix and I assume that is your issue too. Sadly there is no direct way to adjust this other than shimming the head. Good luck!
The machines need to be bolted down, & shimmed level. If the machine is in a twist you can think you have an out of tram condition.
Now on the other side of this, my 728VT was sent to with .039 of NOD , PM finally agreed to R&R the machine.
I agree, There are no nod adjustments for this machine. Unless I come up with a different workbench, Maybe a steel plate or steel stand to put it on I am not sure how rigid I can make the machine, I think I will always have some out of spec settings but it isnt 40 thou out like Aarons was. It's about time for me to retram or at least check the head tilt again now that its been almost a year using it. You are right, If I had to I could add some shims under the column to adjust the nod. Good luck and thanks for watching.
Deez.....A) try using a heavy oil both under the paper and on top. B) you want flat? Scrape it or do a "blue fit" on it as the old masters would say C) the sphere on the end of the rod for your surface gauge...I was taught that is where the hooked end of the scribe went for storage.
I tagged you my last video...I hope it works right. Do you want a video on lapping cylinder bores?
I will try your suggestions on the next attempt at flattening this homemade surface guage/stand. I am familiar wtih scraping but never tackled that. That honestly would be the better way to go for the bottom onf this surface gauge but I dont hvae the equipment and certainly no skills on doing that. Its an interesting process for sure. I need to read up more on the scherical end of that surface gauge. Thanks for tagging me in your last video, If you made a video on lapping cylinder bores id certainly watch it. It will be helpful when I decide to tackle one of the more advanced model engines. Thanks for watching and thanks for the tips.
@@deezworkshop I posted the cylinder lapping video!
Without a surface grinder, 3 points on that home made hight gage will take the rock out. Easyer to lap also. You are learning fast Deez. You have a new trade to fall back on. Having fun is everything for now. Good job.
@@fasturn-fc2of I appreciate the kind words. There is so many things to learn, The world of hobby machining,,well machining as a trade, has so many aspects to learn. It's not just about turning metal and making chips.
Deez with that statement, your going to do well ! At TRW / NGC the machinist programed CAD / CAM , did designs and machining parts. Called Cradle to gave. No mechanical engineer did that ! The machinist is pinnacle of craftsman ship. After 50 years in tool n die / aerospace, I learned something new every day. So will you 😊