Joining to cast iron soil stack - best cutting technique?

[The Drain Dept.]

How do others cut into cast iron soil stacks. I need to cut into one on Saturday to clear a blockage.
In plastic I usually use a 57mm hole saw then fit a blanked waste pipe strap when finished but my drill rips my arm off when it snags.
This one in cast iron needs to preserve visual quality so pref not to cut a section out and fit band seals.
Do I just need a better clutched drill and a good quality hole saw?
Any tips?

Thanks

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[glenno1]

Is there no access points or can you not get in from the top

 

[The Drain Dept.]

No there are no rodding accesses or connections which can be used as one. Drain connects blind between 2 inspection chambers so no way to come upstream to it.
Cast iron looks like it may originally have been the vent to the system but has later been adapted by someone adding a saniflow connection at high level from attic. Terminal is above roof 3 floors so way to high to rod down. A cut into base just above ground level looks like first option to try.
Cheers

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[Rodolphe]

I found this post while looking to answer the same question. I need to connect a new WC waste into an existing cast-iron pipe. Is it even possible or will I have to replace the whole cast-iron bit? What do you guys do?

 

[Simon F]

Flexseal CouplingsDrainage Pipe and Fittings | Drainage Online

you can remove part of the cast then connect into it with plastic using something like in the link,
or for the first question cut through the cast pipe and then fit a connection ( but not the prettiest option )

How to join cast iron pipe or copper pipe to plastic pipe using fernco couplings.Plumbing Tips! - YouTube

 

[BLOD]

you could use a timesaver fitting, they also do a strap on boss for cast iron.

 

[stevetheplumber]

fernco rubbers if its domestic in the back yard and customer doesnt care how it looks or cut in a timesaver rodding eye and two TS couplings if it has to look right
notb sure if its even called timesaver anymore last lot i bought was called ensign

 

[Rodolphe]

So, basically, no drilling nice circular holes into the cast-iron pipe and branching out in UPVC. Got it Lucky HSS rents chain cutters for not too much money.

Thanks guys.

 

[WHPES]

Rotabroach with magnetic clamp.