Wadkin AGS10 table saw casting repair

[brewdexta]

I was just about to make a new riving knife for this table saw, and I noticed the casting is missing a bit. I must need new specs, I was wondering why this saw only had one slot hence one bolt for the riving knife, now I know. The bolt is resting where the top slot should be, pretty obvious now

So the plan is as follows, trim up the casting a bit to get straight, square edges

then make something like this, dowelled into the cast on the left, then bolted down on the right, the casting will be tapped M4. Major forces are lateral and its not the only fixing as there is the slot below.

I was thinking of adding some weld/braze but I don't think its necessary. I have a suitable bit of 10mm plate. Before I start grinding and machining, any better ideas? I don't have tig, just mig and stick.

Cheers
Andy

 

[Screwdriver]

If you don't need those last few mm of travel you could sacrifice that semicircle and cut the insert square which gives you a bit more room for an extra bolt.

 

[julianf]

I've not got around to checking mine, but if it's flat, I'm wondering if a replica wouldn't almost be easier than trying to mend yours?

https://www.advancedmachinery.co.uk...brt-riving-knife-bracket-c-1026m-113-923-1707


(For photos, not for buying!)

 

[brewdexta]

Thanks guys

I want it to look reasonably factory as I'm selling it however I could widen the right hand pillar a bit to get two screw in, the amount of adjustment needed for the riving knife is a fraction of the whole slot. I may do something similar at the other end so I can get a dowel and a screw in it.

Cheers
Andy

 

[slim_boy_fat]

On the back of @julianf's suggestion, could you get someone to plasma cut one for you, rather than repair?

 

[500e]

Did @julianf have a spare wadkin

 

[brewdexta]

On the back of @julianf's suggestion, could you get someone to plasma cut one for you, rather than repair?

I have a plasma, I guess I could cut a big bit of 10mm plate. I'll have a think about it

 

[slim_boy_fat]

I have a plasma, I guess I could cut a big bit of 10mm plate. I'll have a think about it

Probably be easier & stronger in the long run.

 

[brewdexta]

true but a lot more work in dismantling it, and machining given I'm selling it. I want the repair to be safe but quick, if I was keeping it I would replace it definitely. Decisions, decisions

 

[slim_boy_fat]

I want the repair to be safe but quick,

Sets rock hard in 24 hours......

 

[slim_boy_fat]

@bigegg I can send you some if you'd like to try it, I bought a load on the 'Bay for next to nowt. Can be drilled, milled, sanded etc.

 

[bigegg]

@bigegg I can send you some if you'd like to try it, I bought a load on the 'Bay for next to nowt. Can be drilled, milled, sanded etc.

very kind of you.
think it would be of more use to @brewdexta though.

 

[slim_boy_fat]

very kind of you.
think it would be of more use to @brewdexta though.

In my defence, I was thinking of what to have for tea - curry is the answer.

 

[brewdexta]

My neighbour the tool maker/farmer has just been around, he dropped off a piece of ali bar I wanted 1mm milling off, could have done it myself but it was over 2 foot long and his machines can do that in one pass. In return I've made him a charging cable for a pair of suction lifting pads he has acquired from a skip, dumped because the charger was missing. They lift about 160kg each, they have an alarm size AGM battery in each of them. They have an XLR socket on the side for charging, so I made a lead that adapts this to a CTEK charger for him. We just tested a suction pad on the cast iron table of a table saw (12", not the subject of this thread) and it stuck like the proverbial to a blanket so he's a happy chap

Anyway, while he was here I had him take a look. He concurs with @Screwdriver regarding losing a few mm of adjustment to get an extra bolt in. I asked him about making a new plate up, hoping he would volunteer his services His opinion was that it was a lot more work if I'm flogging it. I didn't lead the witness my honour, but I trust his judgement being a tight farmer that likes to mend rather than buy, but always does a good job being a toolmaker.

So I shall start next weekend, in between kitchen cabinet and tractor work

 

[Screwdriver]

Anyway, while he was here I had him take a look. He concurs with @Screwdriver regarding losing a few mm of adjustment to get an extra bolt in.

Well I like him already. You have to remember those slots are only that shape because the item is cast. Easier to cast, no stress riser at a weak point, no sharp edges in the mould.

 

[brewdexta]

Sorted. I didn't want to cut into a piece of 10mm plate so went on a hunt and found a bit of 10mm x 40mm bar. Looked to be mild steel, it had come from something else as it has a few countersunk holes in it but it looked ideal. All went well until the last hole, it was a swine to drill, it was at one end so I wonder if the bar had been case hardened or similar My drills wouldn't touch it and I didn't have anything other than HSS under 4mm and the holes are 3.3mm. I got it in the end by drilling from the other side, which was fine, weird. I didn't have any long countersunk bolts but these look fine, if they catch on the underside of the top then I'll get some.

There's enough adjustment on the shortened slot, I just need to make the riving knife, here's the CAD template, I shall trim the curve to allow for the radius of the plasma cutter tip then make it in MDF. The bolts for the riving knife are 30 quid each from Advance machinery Services, and the washers a tenner each, and you need two of each, so a total of 80 quid +VAT. I think I may make them

Cheers
Andy