reduction bushing thing for mounting stem on comparator stand? - Page 1
Forum section: electronics / general

author: coppercone2
author_rank: Super Contributor
timestamp: April 07, 2023, 08:30:57 pm
content: I have a comparator stand that has a 1/2 inch or so hole for the indicator. The other comparator stand I have fits the common indicators fine. I mean like a C shaped section of metal that clamps on the indicator with a knob.What kind of hardware would I need to attach a undersized indicator shaft to one of those clamps?I thought maybe to cut a slot in a bushing or something... It needs to be precise because they do like 0.001mm, it needs to clamp well

author: Overspeed
author_rank: Frequent Contributor
timestamp: April 08, 2023, 08:18:13 am
content: HelloI use Nylon 66 sleeve with one cut to make a look a like spring collet as measuring force are low that works nice , you can use also brass alloy but you need to make one cut and one groove at the opposite to provide more flexibility as screw force on dial bench are low .RegardsOS

author: coppercone2
author_rank: Super Contributor
timestamp: April 08, 2023, 07:41:27 pm
content: Actually I found the part from starrett, called a split reduction bushing.The problem is that one of the comparators has a 0.465 dimension, and starrett has something for this, but its not exactly a split bushing, and the 0.465 stand does not have a split clamp, it just has a hole with a set screw.But it turns out that the 0.375 stem micrometer fits fine into the 0.465 stand with the set screw, so I just need a 0.315 to 0.375 adapter to fit the 0.315 to split clamp.I tested the 0.375 shaft dial indicator in the 0.465 micrometer stand, and it seems to pass the 'slide and rotate the gauge block around the surface' test.One stand is fowler and is quite big (4x4 inches square or so) and the other is only 2 inch circle (mitutoyo)

author: Overspeed
author_rank: Frequent Contributor
timestamp: April 09, 2023, 10:06:54 am
content: HelloLathe turned a nylon 66 split collet can be done in less than 15 minutes without any particular skills in machining and for a cost of nearly nothing as you can bore with a small single point tool .RegardsOS

author: coppercone2
author_rank: Super Contributor
timestamp: April 09, 2023, 10:38:33 am
content: for those with a lathe, I would need to ask someone, 15 dollars not worth bothering for a favor

author: Overspeed
author_rank: Frequent Contributor
timestamp: April 09, 2023, 01:09:07 pm
content: HelloOK but if you works on mechanical project a small chinese made metal lathe is the tool to have that allow to do a lot including basic milling operationYou can also 3D print it perhapsRegardsOS

author: coppercone2
author_rank: Super Contributor
timestamp: April 09, 2023, 01:32:25 pm
content: If I had a filament printer, the resin one is too brittle.The best I could do is milling with the proxxon plate that rotates with the hand knobs lol. I bet I could make something but on tall structures its really bogged down and vibrates alot, even with the epoxy lead sand filling. But thats with metal, on plastic it might be OK, but its still kinda finicky IMOSize is the problem, and money too, food got so expensive that buying the little higher quality hobby lathe that I wanted is cost prohibitive.https://www.amazon.com/Proxxon-24264-Dividing-Attachment-MF/dp/B0016KFVVGI did manage to slim down aluminum rods with it, but jesus I hate the manual scales. Thought about trying to attach a micrometer to it some how as a XY indicator but I got distracted from it. I see alot of projects with people tricking out the machines.But even if I want to try that I need to buy a new XY table for it, because the one I had broke in shipping and I fixed it with super glue and clamps, but its dodgyMight try to figure out a lathe eventually, because it does get in the way alot, feel like it would get rid of alot of mental gymnastics. Kind of started to feel like the whole nothing having a basic lathe is occupying too much resources in my brain while problem solving, like if it was a company, no-lathe solutions is like a department.... the 'north korea' zoneSince I got the surface plate operational after all these years, its become more interesting to make parts.

author: Overspeed
author_rank: Frequent Contributor
timestamp: April 09, 2023, 03:53:30 pm
content: HelloIf you have a milling machine you make lathe turningYou hold for piece of round barr is the rotating tool holder which as suppose is a chuck ?You hold the lathe tool in the vise , you can do a lathe tool with a broken end mill or a tap or a even an old fileYou set the cut deepness with your table axis and you have a latheEasy to do , looks these videoAsap the OD is OK you cut the lenght you want , hold your part in the vise drill it , no real need to be perfectly center to the diamter of your comparator stem and your parts is ready to be slice to make a basic spring colletRegardsOS