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22nd Jun 2020, 05:54 PM #16
Hi Neevo, Guys,
I've used all sorts of pieces of HSS, Carbide inserts and files as makeshift scrapers. Grinding the end of a smallish file works very well and you don't need to go grinding large areas of teeth off, a few rows off the end so that it doesn't contact the work is enough. I made a handle out of a broom staff for one that I made.
Having said that I was given a Sankvik carbide scraper and some new tips. So far I've never used it !Best Regards:
Baron J.
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22nd Jun 2020, 05:57 PM #17Golden Member
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A quick check of the gib shows a bow at the tip. Enough to lift the gib in the air if pushed.
I will order a surface plate and see how I can address that first as I’m sure it doesn’t help, but is concentrated to the end 10mm of the gib. I’m sure there is a slight bow to it too but cannot see light underneath it when I put it on my stone bench top.
I will pull the table off at some point too and make some measurements of the dovetails on the lower and upper sections to see how/if they are the cause if my issue too.
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22nd Jun 2020, 11:52 PM #18Golden Member
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Is something like this ok to try and scrape in the dovetails? I assume this means it’s flat to within half a thousandth over the 18” length?
https://www.ebay.com.au/itm/153055311175
I’ve bought from the seller before and very impressed with the quality for the price.
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23rd Jun 2020, 12:12 AM #19Most Valued Member
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I don't think that will have enough area for you to spot up on really. That style are useful for finding local depressions with something like a feeler guage.
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23rd Jun 2020, 12:27 AM #20
Hi Neevo, Guys,
Just to check your gibb strip just use the mill table or lathe bed, or as I do a nice porcelain tile !Best Regards:
Baron J.
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23rd Jun 2020, 07:35 AM #21Golden Member
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23rd Jun 2020, 07:45 AM #22Golden Member
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Try and repair or learn to live with it?
I will try it on the mill table but the surface finish is less than desirable. Was going to grab a small surface plate to check it against, but in the mean time will find some other surfaces to check it on too.
Here it is on my kitchen bench:
On seeing it here it actually appears a lot worse than I first thought and has a big bow. Also the left front end (as in the pic) is also higher (it has a twist front to back).
The spring effect that this must have would surely cause a lot of my issues? What should my approach be to try and fix?
Do I need to try and bend it back before scraping it in?
Do I need to ensure both sides are flat before trying to match it to the 2 dovetails?
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23rd Jun 2020, 08:16 AM #23
If this Russian straight edge is of any use you’re welcome to borrow it.
H.Jimcracks for the rich and/or wealthy. (aka GKB '88)
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23rd Jun 2020, 08:38 AM #24Golden Member
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Try and repair or learn to live with it?
That’s very kind clear out but I suspect it won’t go in to the dovetails? Might work for the flats though. Where are you based?
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23rd Jun 2020, 09:36 AM #25
I’m in Concord.
Retired, so home most of the time out in the shed.
PM me a phone number if you want to arrange pick up.
H.Jimcracks for the rich and/or wealthy. (aka GKB '88)
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23rd Jun 2020, 10:09 AM #26Golden Member
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23rd Jun 2020, 10:21 AM #27Golden Member
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Try and repair or learn to live with it?
Surface plate has been back ordered. Only a small one (300x230mm) but is better than not having one I thought.
I’ve also ordered some 16mm gauge pins so I can measure the dovetail wear.
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23rd Jun 2020, 12:49 PM #28Most Valued Member
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I sent you a PM about a straight edge too.
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23rd Jun 2020, 01:50 PM #29Most Valued Member
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That gib could be Cast Iron so straightening it by bending might be a disaster.
Bit hard to tell from your pic but that end looks like its up by at least 1 mm. If that's the case it will take forever to scrape true. You might have to consider filing (or belt sanding) the high spots down before scraping. Did you take note of how much travel was left on your gib adjusting screws before you pulled it out? Once you have it straight, you might find it goes in too far so you might have to shim the back of it as well. All good fun.
peter
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23rd Jun 2020, 01:59 PM #30Golden Member
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It looks like cast iron, so I’ll be thoughtful before trying to rectify the bend. Didn’t note the screw and how much travel I had but easy to pop it back in. Keen to get some measurements of the dovetails tonight, so might do that first.
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