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  1. 8th June 2021, 08:02 PM #1
    Albert
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    Default Have you guys had this?

    I bought some finger jointed board recently, thought I give it a try, as I've never used finger jointed board before.

    After a few metres of feeding through the feeder for profiling on the spindle moulder, I notice the finish is not as good as when I started, I stopped the machine and noticed damages to the knife. I put the feeder away and use manual feeding to see what was happening, I can see sparks at every finger joint.

    is the resin/glue causing this? am I feeding it too fast? or combination of causes?

    Thanks guys

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  3. 8th June 2021, 08:32 PM #2
    elanjacobs
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    The resin glue in MDF, ply and all the others is highly abrasive and will destroy HSS in short order (as you've discovered). Carbide knives only when working with manufactured board.
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  4. 8th June 2021, 09:48 PM #3
    riverbuilder
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    It’s the paint. I run it through the drum sander or the saw first to get it off. Seen the same thing before and it destroyed a set of spindle cutters in about 2 5.4m lengths.
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  5. 9th June 2021, 10:03 AM #4
    Albert
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    Quote Originally Posted by elanjacobs View Post
    The resin glue in MDF, ply and all the others is highly abrasive and will destroy HSS in short order (as you've discovered). Carbide knives only when working with manufactured board.
    Thanks Elan, I will give it a try using my tungsten carbide cutterblock.
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  6. 9th June 2021, 10:05 AM #5
    Albert
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    Quote Originally Posted by riverbuilder View Post
    It’s the paint. I run it through the drum sander or the saw first to get it off. Seen the same thing before and it destroyed a set of spindle cutters in about 2 5.4m lengths.

    Cheers River, I will also do this as well... must say the paint is really hard... but the sparks shooting from each joint maybe the resinous glue... may have to use cutter block with HWM knives.
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  7. 9th June 2021, 06:19 PM #6
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    AlexS
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    Interesting that they're using resin glue. About 40 years ago a big pine timber supplier decided to produce finger jointed timber at their Tumut mill, using PVA glue. What could go wrong? PVA glue is good as long as it's dry and isn't applied below 10deg C.

    The average temperature in Tumut from June to August is < 7deg C.
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  8. 9th June 2021, 06:25 PM #7
    elanjacobs
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    Quote Originally Posted by AlexS View Post
    Interesting that they're using resin glue. About 40 years ago a big pine timber supplier decided to produce finger jointed timber at their Tumut mill, using PVA glue. What could go wrong? PVA glue is good as long as it's dry and isn't applied below 10deg C.
    I believe they use radio frequency curing in conjunction with resin glue to get insanely fast cure times. Resin also isn't subject to creep like PVA is.
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  9. 9th June 2021, 06:28 PM #8
    Albert
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    just an update

    I have removed the paint using sander and use my other cutter block set with HWM (Tungsten Carbide) knives set. problem resolved.

    Thank you for your time and input!

    Conclusion: FJ board probably not worth it unless its the size you want!
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  10. 9th June 2021, 11:04 PM #9
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    AlexS
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    Quote Originally Posted by elanjacobs View Post
    I believe they use radio frequency curing in conjunction with resin glue to get insanely fast cure times. Resin also isn't subject to creep like PVA is.
    Thanks, I'd heard of using RF curing, but not in connection with finger jointed pine. I think it was in laminated furniture.
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  11. 9th June 2021, 11:48 PM #10
    Glider
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    Quote Originally Posted by elanjacobs View Post
    I believe they use radio frequency curing in conjunction with resin glue to get insanely fast cure times. Resin also isn't subject to creep like PVA is.
    For RF to work, it needs certain metals present. I wonder if they're mixing something like Al powder in with the resin.

    mick
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  12. 9th June 2021, 11:54 PM #11
    Bohdan
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    Quote Originally Posted by Glider View Post
    For RF to work, it needs certain metals present. I wonder if they're mixing something like Al powder in with the resin.

    mick
    No metal required, it works on the moisture in the glue, same as heating stuff in the microwave.
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  13. 10th June 2021, 09:30 AM #12
    yvan
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    Hmm,

    I'll check with me dentist !!! He uses some fancy resins to fill holes and hardens them up with some sort of a torch/zapper
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  14. 10th June 2021, 10:32 AM #13
    elanjacobs
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    Quote Originally Posted by yvan View Post
    Hmm,

    I'll check with me dentist !!! He uses some fancy resins to fill holes and hardens them up with some sort of a torch/zapper
    Those are UV cure. Totally different stuff
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