Alternative mirror base tester?

[mura_gadi]

Hello,

Still procrastinating on my test stand, an interweb search turned up the link below. They are essentially $35-$50 (40mm-60mm base plate) unit with a micrometre built-in at .01mm and 10mm travel either side of centre.

Considering a good dial indicator is around $100 these looked to be good value for money (if they're accurate). Thought a pair for x-y axis control would be great for simplifying the mirror tester and costs about the same as just the dial indictor.

Any thoughts?



Thanks
Steve

Type: Manual Displacement Platform
Stroke: ± 6.5mm
Load: 39.2N (4kgf)
Material: Aluminum alloy
Accuracy: 0.01mm
Parallelism: 0.03mm
Weight: 0.21kg

Units available are X, Y, Z and R.

https://www.aliexpress.com/item/32847212657.html?spm=a2g0o.productl ist.0.0.782e2e47UNv8Jk&algo_pvid=a5befbbb-1a0f-4891-ae9d-de72abaa6153&algo_exp_id=a5befbbb-1a0f-4891-ae9d-de72abaa6153-0&pdp_ext_f=%7B%22sku_id%22%3A%226598 5757470%22%7D&pdp_npi=2%40dis%21AUD%2138.27%2134. 82%21%21%2111.14%21%21%4021031a5516 658774886063733eb882%2165985757470% 21sea&curPageLogUid=hrktFR2EDIwK

[Rod]

Hi Steve

You could do that. I’m sure it could be made to work as long as the product is reasonably well made. Just seems a bit expensive for a tester you can make for virtually nothing. I’ve never spent $100 on a dial indicator for this purpose. If you search eBay you’ll find cheap dial indicators for $15 to $25. If you want to be really cheap you get tire depth gauges that read to .01 mm. Bojan suggested these in a post once. You can get them for around $7 to $10. Here is one example:

https://www.ebay.com.au/itm/115361271834?mkcid=16&mkevt=1&mkrid=705-154756-20017-0&ssspo=PbptxPyVRDi&sssrc=2349624&ssuid=5hr8uCcsQK6&var=&widget_ver=artemis&media=COPY

You just need to add a small spring to make it work like a dial indicator. Do you need plans for a tester?

Rod

[mura_gadi]

Thanks Rod, I'll go find Bojan post.

[bojan]

I think I was mentioning this product (https://www.ebay.com.au/itm/363474704641?hash=item54a0c7d901:g: U4UAAOSwNsZhiOQQ&amdata=enc%3AAQAHAAAAoNZRgcbSuoZuVV rnwaHrOWSD4IOywqRsbd4CBmStBr4iYFzU% 2FUg0gSD%2F2ElsnUWF3igylSSJkw4TjgbK %2FBQK4T1g9ZmOkQIo6Bzg4VDBaktHVzt1M cZv7OYVp8RyqAAqS0zLUNorQ4mWYsmUu%2F MiH%2B3fiAMTeBRPJeprypCc1btdly8%2Fq a1G66iEWZp2e019Ko7C9pmeM1oGQjIz7k9t LH4%3D%7Ctkp%3ABk9SR6SXsY79YA) in that post (can't find it..)
As to what Rod mentioned, no need for spring, but you have to remove plastic vipers so the measuring strip moves freely and under it's own weight (if used for vertical displacement).
There is really no need to spend hundreds for "proper" depth gauge, those discussed here are good enough.
This dial indicator (https://www.ebay.com.au/itm/194920831697?hash=item2d622fdad1:g: ePoAAOSwISdiNDAY&amdata=enc%3AAQAHAAAAwJqE%2BCmDHM%2 BCVETqrDzYltIdup3Msl8Ddtltp2rU5JvAz hR%2BfklfCF1phgX7agYNWUTyHd3TCxNr6n eXT3LKqQ4Ev%2BjQQZ%2FFBYWmyfiU8%2Bh zGBtnkr17GKTiMEobF0PAbza7Q2MPTyloMU w%2Bb2ffPvn04C5tiw00bz5Yu8SOjwJIN2p Jao3xjBHbnlUUN7%2FwRpnu2OcSFZjVy7IR 3CYc3rRbhuYEozUR4E5rx11mMaVqXRKAamj nCxT3ldS3osFZuQ%3D%3D%7Ctkp%3ABlBMU LCK3479YA) is also good and accurate... as this one (https://www.ebay.com.au/itm/373943496239?hash=item5710c4ee2f:g: EcUAAOSwBbdiDa2X&amdata=enc%3AAQAHAAAA4PemmYgq58bYVU tfYADeecycWb7iTAyPkGU5f416eHnpNVrYR gTscFPSsZgG3G2OYGgTfR9QxizZvWY3ZGR4 UVulDa7%2BQr1ZL1I3%2FOf12EoG9zxMsbN JaLwOiD9yc6%2BJVXiVm3U1K4TxMyU%2BTW K5YFfQyA3Z9GucO1r4pXdGKjf3cJf53Xun5 UZRO%2B03nuXFYNp6WkHAwhkjSVRelgiZVv U6to88BpxqkeLkcFV5trsD4LiHpH467AFh4 iPXIrxqhsTyNkEKsyNDyLUnzlPjxH5czA7J IlW8EI9gbgfxBq7t%7Ctkp%3ABk9SR7SK34 79YA).